( (2x+3y)2 +(2x-3y)2 ) का सरल रूप क्या है?
What is the simplified form of ( (2x+3y)2 +(2x-3y)2 )?
#sum identity
#binomial square
#simplification
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A \(4x^2+9y^2\)
B \(8x^2+18y^2\)
C (24xy)
D \(8x^2-18y^2\)
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Correct Answer
B. \(8x^2+18y^2\)
Explanation
Simple Explanation
( (a+b)2 +(a-b)2 =2a-2 +2b-2 ) लगाएँ। यहाँ (a=2x) और (b=3y) है। / Use ( (a+b)2 +(a-b)2 =2a-2 +2b-2 ). Here (a=2x) and (b=3y).
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( (4a+b)2 -(4a-b)2 ) का सरल रूप क्या है?
What is the simplified form of ( (4a+b)2 -(4a-b)2 )?
#difference identity
#4uv
#algebra
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A (8ab)
B (16ab)
C \(4a^2-b^2\)
D (32ab)
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Explanation
Simple Explanation
( (u+v)2 -(u-v)2 =4uv ) होता है। (u=4a) और (v=b) रखने पर (16ab) मिलता है। / ( (u+v)2 -(u-v)2 =4uv ). With (u=4a) and (v=b), the result is (16ab).
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\( 9x^2-30x+25 \) किसका पूर्ण वर्ग है?
\( 9x^2-30x+25 \) is the perfect square of what?
#perfect square
#recognition
#minus identity
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A ( (3x+5)2 )
B ( (9x-5)2 )
C ( (3x-5)2 )
D ( (x-15)2 )
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Correct Answer
C. ( (3x-5)2 )
Explanation
Simple Explanation
(9x-2 =(3x)2 ) और \(25=5^2\) है। बीच का पद ऋणात्मक है इसलिए ( (3x-5)2 ) सही है। / (9x-2 =(3x)2 ) and \(25=5^2\). The middle term is negative, so ( (3x-5)2 ) is correct.
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( (2p-3q+r)2 ) में (pq) वाला पद कौन सा है?
Which is the (pq)-term in ( (2p-3q+r)2 )?
#three term square
#pq term
#negative sign
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A (6pq)
B (-6pq)
C (-12pq)
D (12pq)
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Correct Answer
C. (-12pq)
Explanation
Simple Explanation
(2p) और (-3q) का दोगुना गुणनफल (-12pq) है। परीक्षा में चिन्ह के साथ गुणांक भी देखें। / Twice the product of (2p) and (-3q) is (-12pq). Exam tip: check both sign and coefficient.
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\( 121a^2-49b^2 \) का सही गुणनखंड रूप कौन सा है?
Which is the correct factor form of \( 121a^2-49b^2 \)?
#difference of squares
#factorisation
#two variables
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A ( (11a+7b)(11a-7b) )
B ( (121a+49b)(a-b) )
C ( (11a-7b)2 )
D ( (a+7b)(121a-7b) )
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Correct Answer
A. ( (11a+7b)(11a-7b) )
Explanation
Simple Explanation
यह ( (11a)2 -(7b)2 ) है। अंतर के वर्गों में (a-2 -b-2 =(a+b)(a-b)) लगता है। / This is ( (11a)2 -(7b)2 ). For difference of squares, use (a-2 -b-2 =(a+b)(a-b)).
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( (3x-4)(3x+7) ) में (x) का गुणांक क्या है?
What is the coefficient of (x) in ( (3x-4)(3x+7) )?
#binomial product
#cross terms
#coefficient
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A (33)
B (9)
C (21)
D (12)
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Explanation
Simple Explanation
क्रॉस पद (21x) और (-12x) हैं। उनका योग (9x) है। / The cross terms are (21x) and (-12x). Their sum is (9x).
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( (x+4)(x-9)-x-2 ) का सरल रूप क्या है?
What is the simplified form of ( (x+4)(x-9)-x-2 )?
#simplification
#binomial product
#mixed signs
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A (5x-36)
B (-5x-36)
C (-13x-36)
D (13x-36)
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Correct Answer
B. (-5x-36)
Explanation
Simple Explanation
( (x+4)(x-9)=x-2 -5x-36 ) है। \(x^2\) घटाने पर (-5x-36) बचता है। / ( (x+4)(x-9)=x-2 -5x-36 ). Subtracting \(x^2\) leaves (-5x-36).
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( (a+b+c)2 -(a-b+c)2 ) का सरल रूप क्या है?
What is the simplified form of ( (a+b+c)2 -(a-b+c)2 )?
#identity transformation
#three terms
#difference of squares
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A (4ab+4bc)
B (2ab+2bc)
C (4ac)
D (4b(a+c))
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Correct Answer
D. (4b(a+c))
Explanation
Simple Explanation
इसे ( ((a+c)+b)2 -((a+c)-b)2 ) मानें। (4(a+c)b=4b(a+c)) मिलेगा। / Treat it as ( ((a+c)+b)2 -((a+c)-b)2 ). It gives (4(a+c)b=4b(a+c)).
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( (2x+5)2 -4x-2 ) का गुणनखंड रूप क्या है?
What is the factor form of ( (2x+5)2 -4x-2 )?
#factorisation
#difference of squares
#simplified factor
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A (5(4x+5))
B ( (2x+5)(2x-5) )
C (20x+25)
D \(4x^2+25\)
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Correct Answer
A. (5(4x+5))
Explanation
Simple Explanation
यह ( (2x+5)2 -(2x)2 ) है। गुणनखंड (5(4x+5)) बनते हैं। / This is ( (2x+5)2 -(2x)2 ). The factors simplify to (5(4x+5)).
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\( 1008^2-992^2 \) का मान क्या है?
What is the value of \( 1008^2-992^2 \)?
#numerical identity
#difference of squares
#large numbers
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A (16000)
B (32000)
C (20000)
D (8000)
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Correct Answer
B. (32000)
Explanation
Simple Explanation
(a-2 -b-2 =(a+b)(a-b)) से \(2000\cdot16=32000\) है। परीक्षा में दोनों वर्ग अलग-अलग न निकालें। / Using (a-2 -b-2 =(a+b)(a-b)), \(2000\cdot16=32000\). Exam tip: do not calculate both squares separately.
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\( 997^2 \) का मान सर्वसमिका से क्या होगा?
Using identity, what is the value of \( 997^2 \)?
#mental math
#minus square
#997 square
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A (994009)
B (994900)
C (994009)
D (990049)
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Correct Answer
A. (994009)
Explanation
Simple Explanation
(997=1000-3) है और ( (1000-3)2 =1000000-6000+9 ) है। इसलिए (994009) सही है। / (997=1000-3) and ( (1000-3)2 =1000000-6000+9 ). Therefore (994009) is correct.
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( (x+2)2 +(x+3)2 -2(x+2)(x+3) ) का सरल रूप क्या है?
What is the simplified form of ( (x+2)2 +(x+3)2 -2(x+2)(x+3) )?
#identity recognition
#perfect square
#simplification
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A (1)
B (2x+5)
C \(x^2+5x+6\)
D (0)
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Explanation
Simple Explanation
यह (a-2 +b-2 -2ab=(a-b)2 ) है। यहाँ (a=x+2) और (b=x+3), इसलिए परिणाम (1) है। / This is (a-2 +b-2 -2ab=(a-b)2 ). Here (a=x+2) and (b=x+3), so the result is (1).
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( (2a+3b+4c)2 ) में (bc) वाला पद क्या होगा?
What will be the (bc)-term in ( (2a+3b+4c)2 )?
#three term square
#bc term
#coefficients
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A (12bc)
B (24bc)
C (7bc)
D (48bc)
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Explanation
Simple Explanation
(3b) और (4c) से \(2\cdot3b\cdot4c=24bc\) मिलता है। परीक्षा में हर जोड़े का दोगुना लें। / From (3b) and (4c), \(2\cdot3b\cdot4c=24bc\). Exam tip: take twice every pair product.
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( (5m-2n)2 -(5m+2n)2 ) का सरल रूप क्या है?
What is the simplified form of ( (5m-2n)2 -(5m+2n)2 )?
#difference identity
#negative result
#binomial square
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A (40mn)
B (-40mn)
C \(25m^2-4n^2\)
D (20mn)
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Correct Answer
B. (-40mn)
Explanation
Simple Explanation
क्रम उल्टा है, इसलिए ( (u-v)2 -(u+v)2 =-4uv ) होगा। (u=5m), (v=2n), इसलिए (-40mn) है। / The order is reversed, so ( (u-v)2 -(u+v)2 =-4uv ). With (u=5m), (v=2n), the result is (-40mn).
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\( x^2+2xy+y^2-25 \) का गुणनखंड रूप क्या है?
What is the factor form of \( x^2+2xy+y^2-25 \)?
#factorisation
#perfect square
#difference of squares
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A ( (x+y+5)(x+y-5) )
B ( (x-y+5)(x-y-5) )
C ( (x+y-25)(x+y+1) )
D ( (x+y)2 +25 )
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Correct Answer
A. ( (x+y+5)(x+y-5) )
Explanation
Simple Explanation
पहले (x-2 +2xy+y-2 =(x+y)2 ) पहचानें। फिर ( (x+y)2 -52 ) पर अंतर के वर्ग लगाएँ। / First identify (x-2 +2xy+y-2 =(x+y)2 ). Then apply difference of squares to ( (x+y)2 -52 ).
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\( 4p^2-12pq+9q^2-16 \) का गुणनखंड रूप क्या है?
What is the factor form of \( 4p^2-12pq+9q^2-16 \)?
#factorisation
#compound identity
#perfect square
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A ( (2p-3q+4)(2p-3q-4) )
B ( (2p+3q+4)(2p+3q-4) )
C ( (2p-3q)2 +16 )
D ( (4p-9q+4)(p-q-4) )
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Correct Answer
A. ( (2p-3q+4)(2p-3q-4) )
Explanation
Simple Explanation
पहले (4p-2 -12pq+9q-2 =(2p-3q)2 ) है। फिर ( (2p-3q)2 -42 ) का गुणनखंड करें। / First (4p-2 -12pq+9q-2 =(2p-3q)2 ). Then factor ( (2p-3q)2 -42 ).
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( (x+6)(x-4)(x+1) ) में पहले दो गुणनखंडों का सही प्रसार क्या है?
What is the correct expansion of the first two factors in ( (x+6)(x-4)(x+1) )?
#stepwise expansion
#binomial product
#intermediate form
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A \(x^2+2x-24\)
B \(x^2-10x-24\)
C \(x^2+10x-24\)
D \(x^2+2x+24\)
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Correct Answer
A. \(x^2+2x-24\)
Explanation
Simple Explanation
( (x+6)(x-4)=x-2 +2x-24 ) है। परीक्षा में आगे बढ़ने से पहले प्रथम चरण सही करें। / ( (x+6)(x-4)=x-2 +2x-24 ). Exam tip: make the first step correct before moving ahead.
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( (a+b)2 +(b+c)2 +(c+a)2 ) में (ab) वाला पद कुल कितना है?
What is the total (ab)-term in ( (a+b)2 +(b+c)2 +(c+a)2 )?
#term analysis
#sum of squares
#ab term
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A (ab)
B (2ab)
C (4ab)
D (0)
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Explanation
Simple Explanation
केवल ( (a+b)2 ) से (2ab) आता है। बाकी दो वर्गों में (ab) पद नहीं बनता। / Only ( (a+b)2 ) gives (2ab). The other two squares do not produce an (ab)-term.
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( (x+y)2 -(x-y)2 + (x+2y)2 -(x-2y)2 ) का सरल रूप क्या है?
What is the simplified form of ( (x+y)2 -(x-y)2 + (x+2y)2 -(x-2y)2 )?
#combined identities
#4uv
#simplification
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A (8xy)
B (12xy)
C (16xy)
D (6xy)
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Explanation
Simple Explanation
पहला अंतर (4xy) और दूसरा (8xy) है। कुल (12xy) मिलता है। / The first difference is (4xy) and the second is (8xy). The total is (12xy).
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( (2x-5)(2x+5)+25 ) का सरल रूप क्या है?
What is the simplified form of ( (2x-5)(2x+5)+25 )?
#difference of squares
#simplification
#product identity
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A \(4x^2\)
B \(4x^2-50\)
C \(2x^2\)
D \(4x^2+25\)
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Correct Answer
A. \(4x^2\)
Explanation
Simple Explanation
( (2x-5)(2x+5)=4x-2 -25 ) है। (25) जोड़ने पर \(4x^2\) बचता है। / ( (2x-5)(2x+5)=4x-2 -25 ). Adding (25) leaves \(4x^2\).
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( (x+3)2 +(x+4)2 -2(x+3)(x+4) ) का मान क्या है?
What is the value of ( (x+3)2 +(x+4)2 -2(x+3)(x+4) )?
#perfect square identity
#expression simplification
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A (0)
B (1)
C (2x+7)
D \(x^2+7x+12\)
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Explanation
Simple Explanation
यह (a-2 +b-2 -2ab=(a-b)2 ) है। ( (x+3)-(x+4)=-1 ), इसलिए वर्ग (1) है। / This is (a-2 +b-2 -2ab=(a-b)2 ). Since ( (x+3)-(x+4)=-1 ), the square is (1).
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( (3a+2b)2 -(3a-2b)2 ) का सरल रूप क्या है?
What is the simplified form of ( (3a+2b)2 -(3a-2b)2 )?
#difference identity
#binomial square
#4uv
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A (12ab)
B (24ab)
C (36ab)
D \(9a^2-4b^2\)
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Explanation
Simple Explanation
( (u+v)2 -(u-v)2 =4uv ) है। (u=3a), (v=2b) रखने पर (24ab) है। / ( (u+v)2 -(u-v)2 =4uv ). With (u=3a), (v=2b), the result is (24ab).
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( (x+2)(x+5)-(x+3)(x+4) ) का सरल रूप क्या है?
What is the simplified form of ( (x+2)(x+5)-(x+3)(x+4) )?
#comparison of products
#simplification
#constant difference
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A (2)
B (-2)
C (x+2)
D (0)
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Explanation
Simple Explanation
पहला गुणनफल \(x^2+7x+10\) और दूसरा \(x^2+7x+12\) है। अंतर (-2) है। / The first product is \(x^2+7x+10\) and the second is \(x^2+7x+12\). The difference is (-2).
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( (a+b)2 -(a-b)2 ) को (8) के बराबर दिया गया है। यदि (a=2) है तो (b) क्या होगा?
( (a+b)2 -(a-b)2 ) is given equal to (8). If (a=2), what is (b)?
#identity application
#unknown value
#4ab
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A (1)
B (2)
C (4)
D (8)
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Explanation
Simple Explanation
पहचान से परिणाम (4ab) है। \(4\cdot2\cdot b=8\), इसलिए (b=1) है। / By identity the result is (4ab). \(4\cdot2\cdot b=8\), so (b=1).
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( (x+y+z)2 ) में यदि (x=1), (y=2), (z=3) हों तो पहचान से मान क्या है?
Using identity, what is the value of ( (x+y+z)2 ) if (x=1), (y=2), (z=3)?
#three term square
#numerical substitution
#identity value
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A (25)
B (36)
C (49)
D (16)
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Explanation
Simple Explanation
योग (1+2+3=6) है और वर्ग (36) होगा। पहचान में वर्ग और जोड़ीदार पद भी यही मान देते हैं। / The sum is (1+2+3=6), and its square is (36). The identity with squares and pair terms gives the same value.
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( (2x+1)2 -(2x-1)2 =40 ) हो तो (x) का मान क्या है?
If ( (2x+1)2 -(2x-1)2 =40 ), what is the value of (x)?
#equation
#identity application
#solve x
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A (4)
B (5)
C (10)
D (20)
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Explanation
Simple Explanation
( (u+v)2 -(u-v)2 =4uv ) है। यहाँ (u=2x), (v=1), इसलिए (8x=40) और (x=5) है। / ( (u+v)2 -(u-v)2 =4uv ). Here (u=2x), (v=1), so (8x=40) and (x=5).
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( (x+1)(x+2)(x+3) ) के प्रसार में \(x^2\) का गुणांक क्या है?
What is the coefficient of \(x^2\) in the expansion of ( (x+1)(x+2)(x+3) )?
#triple product
#coefficient
#x square
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A (3)
B (5)
C (6)
D (11)
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Explanation
Simple Explanation
तीन रैखिक पदों में \(x^2\) का गुणांक (1+2+3=6) होता है। परीक्षा में पहले दो पदों को खोलकर भी जाँच सकते हैं। / For three linear factors, the coefficient of \(x^2\) is (1+2+3=6). Exam tip: you can also check by expanding the first two factors.
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( (x-2)(x+3)(x+5) ) में \(x^2\) का गुणांक क्या होगा?
What will be the coefficient of \(x^2\) in ( (x-2)(x+3)(x+5) )?
#triple product
#coefficient
#signs
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A (6)
B (5)
C (3)
D (1)
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Explanation
Simple Explanation
\(x^2\) का गुणांक स्थिर संख्याओं का योग (-2+3+5=6) है। परीक्षा में चिन्ह के साथ जोड़ें। / The coefficient of \(x^2\) is the sum of constants (-2+3+5=6). Exam tip: add with signs.
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( (x+2y)2 -\(x^2+4y^2\) ) का सरल रूप क्या है?
What is the simplified form of ( (x+2y)2 -\(x^2+4y^2\) )?
#square identity
#simplification
#common error
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A (2xy)
B (4xy)
C (8xy)
D \(x^2+4y^2\)
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Explanation
Simple Explanation
( (x+2y)2 =x-2 +4xy+4y-2 ) है। \(x^2+4y^2\) घटाने पर (4xy) बचता है। / ( (x+2y)2 =x-2 +4xy+4y-2 ). Subtracting \(x^2+4y^2\) leaves (4xy).
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( (3x-2y)2 -\(9x^2+4y^2\) ) का सरल रूप क्या है?
What is the simplified form of ( (3x-2y)2 -\(9x^2+4y^2\) )?
#minus square
#simplification
#xy term
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A (12xy)
B (-12xy)
C (6xy)
D (-6xy)
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Correct Answer
B. (-12xy)
Explanation
Simple Explanation
( (3x-2y)2 =9x-2 -12xy+4y-2 ) है। \(9x^2+4y^2\) घटाने पर (-12xy) बचता है। / ( (3x-2y)2 =9x-2 -12xy+4y-2 ). Subtracting \(9x^2+4y^2\) leaves (-12xy).
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( (2x+3)2 +(2x-3)2 ) में स्थिर पद कितना है?
What is the constant term in ( (2x+3)2 +(2x-3)2 )?
#constant term
#sum of squares
#binomial identity
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A (9)
B (18)
C (12)
D (36)
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Explanation
Simple Explanation
दोनों वर्गों में स्थिर पद (9) और (9) हैं। इसलिए कुल स्थिर पद (18) है। / Each square has constant term (9) and (9). Therefore the total constant term is (18).
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\( 64x^2+80x+25 \) का पूर्ण वर्ग रूप क्या है?
What is the perfect square form of \( 64x^2+80x+25 \)?
#perfect square
#recognition
#large coefficient
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A ( (8x+5)2 )
B ( (8x-5)2 )
C ( (64x+5)2 )
D ( (4x+5)2 )
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Correct Answer
A. ( (8x+5)2 )
Explanation
Simple Explanation
(64x-2 =(8x)2 ), \(25=5^2\) और बीच का पद \(2\cdot8x\cdot5=80x\) है। / (64x-2 =(8x)2 ), \(25=5^2\), and the middle term is \(2\cdot8x\cdot5=80x\).
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\( 25m^2-70mn+49n^2 \) किसका वर्ग है?
\( 25m^2-70mn+49n^2 \) is the square of what?
#perfect square
#two variables
#minus square
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A ( (5m+7n)2 )
B ( (25m-7n)2 )
C ( (5m-7n)2 )
D ( (m-7n)2 )
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Correct Answer
C. ( (5m-7n)2 )
Explanation
Simple Explanation
(25m-2 =(5m)2 ) और (49n-2 =(7n)2 ) है। बीच का पद (-70mn) इसे ( (5m-7n)2 ) बनाता है। / (25m-2 =(5m)2 ) and (49n-2 =(7n)2 ). The middle term (-70mn) makes it ( (5m-7n)2 ).
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( (x+a)(x-a)\(x^2+a^2\) ) का सरल रूप क्या है?
What is the simplified form of ( (x+a)(x-a)\(x^2+a^2\) )?
#successive identities
#difference of squares
#advanced simplification
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A \(x^4-a^4\)
B \(x^4+a^4\)
C \(x^2-a^2\)
D \(x^4-2x^2a^2+a^4\)
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Correct Answer
A. \(x^4-a^4\)
Explanation
Simple Explanation
पहले ( (x+a)(x-a)=x-2 -a-2 ) है। फिर ( \(x^2-a^2\)\(x^2+a^2\)=x-4 -a-4 ) मिलेगा। / First ( (x+a)(x-a)=x-2 -a-2 ). Then ( \(x^2-a^2\)\(x^2+a^2\)=x-4 -a-4 ).
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( (2x+3y)2 +(2x-3y)2 -\(8x^2\) ) का सरल रूप क्या है?
What is the simplified form of ( (2x+3y)2 +(2x-3y)2 -\(8x^2\) )?
#sum identity
#simplification
#y square
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A \(18y^2\)
B (12xy)
C \(9y^2\)
D (24xy)
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Correct Answer
A. \(18y^2\)
Explanation
Simple Explanation
पहले योग \(8x^2+18y^2\) है। \(8x^2\) घटाने पर \(18y^2\) बचता है। / The sum is first \(8x^2+18y^2\). Subtracting \(8x^2\) leaves \(18y^2\).
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( (x+5)(x-3)+(x-5)(x+3) ) का सरल रूप क्या है?
What is the simplified form of ( (x+5)(x-3)+(x-5)(x+3) )?
#combined products
#simplification
#cancellation
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A \(2x^2-30\)
B \(2x^2+30\)
C \(2x^2\)
D (4x)
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Correct Answer
A. \(2x^2-30\)
Explanation
Simple Explanation
पहला \(x^2+2x-15\) और दूसरा \(x^2-2x-15\) है। जोड़ने पर \(2x^2-30\) मिलता है। / The first is \(x^2+2x-15\) and the second is \(x^2-2x-15\). Adding gives \(2x^2-30\).
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( (x+5)(x-3)-(x-5)(x+3) ) का सरल रूप क्या है?
What is the simplified form of ( (x+5)(x-3)-(x-5)(x+3) )?
#difference of products
#simplification
#linear term
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A \(2x^2-30\)
B (4x)
C (8x)
D (30)
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Explanation
Simple Explanation
दोनों गुणनफल क्रमशः \(x^2+2x-15\) और \(x^2-2x-15\) हैं। अंतर (4x) है। / The two products are \(x^2+2x-15\) and \(x^2-2x-15\). Their difference is (4x).
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( (a+b+c)2 ) में यदि केवल \(a^2+b^2+c^2\) लिखा गया हो तो कौन से पद छूट गए?
If only \(a^2+b^2+c^2\) is written for ( (a+b+c)2 ), which terms are missing?
#common error
#three term square
#missing terms
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A (ab+bc+ca)
B (2ab+2bc+2ca)
C (3abc)
D (a+b+c)
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Correct Answer
B. (2ab+2bc+2ca)
Explanation
Simple Explanation
तीन पदों के वर्ग में जोड़ीदार दोगुने पद भी आते हैं। परीक्षा में (2ab+2bc+2ca) अवश्य लिखें। / The square of three terms also includes twice the pair products. Exam tip: always write (2ab+2bc+2ca).
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\( 202^2-198^2 \) का मान क्या है?
What is the value of \( 202^2-198^2 \)?
#numerical identity
#difference of squares
#shortcut
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A (1600)
B (800)
C (400)
D (2000)
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Explanation
Simple Explanation
(a-2 -b-2 =(a+b)(a-b)) से \(400\cdot4=1600\) मिलता है। परीक्षा में योग और अंतर जल्दी निकालें। / Using (a-2 -b-2 =(a+b)(a-b)), \(400\cdot4=1600\). Exam tip: quickly find sum and difference.
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\( 51^2+49^2 \) को पहचान से सरल करने पर कौन सा मान मिलेगा?
What value is obtained by simplifying \( 51^2+49^2 \) using identity?
#numerical identity
#sum identity
#mental math
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A (5000)
B (5002)
C (4902)
D (5100)
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Explanation
Simple Explanation
इसे ( (50+1)2 +(50-1)2 ) मानें। \(2\cdot50^2+2\cdot1^2=5002\) है। / Treat it as ( (50+1)2 +(50-1)2 ). \(2\cdot50^2+2\cdot1^2=5002\).
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\( 51^2-49^2 \) का मान क्या है?
What is the value of \( 51^2-49^2 \)?
#difference of squares
#numerical shortcut
#51 49
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A (100)
B (200)
C (400)
D (2)
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Explanation
Simple Explanation
(a-2 -b-2 =(a+b)(a-b)) से \(100\cdot2=200\) है। परीक्षा में वर्ग निकालने की जरूरत नहीं है। / Using (a-2 -b-2 =(a+b)(a-b)), \(100\cdot2=200\). Exam tip: no need to calculate the squares.
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( (x+2y)2 -(x-2y)2 ) और (8xy) के बीच क्या संबंध है?
What is the relation between ( (x+2y)2 -(x-2y)2 ) and (8xy)?
#identity verification
#4uv
#relation
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A दोनों बराबर हैं / They are equal
B पहला (4xy) है / The first is (4xy)
C पहला (16xy) है / The first is (16xy)
D दोनों का संबंध नहीं है / They are unrelated
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Correct Answer
A. दोनों बराबर हैं / They are equal
Explanation
Simple Explanation
( (u+v)2 -(u-v)2 =4uv ) है। (u=x), (v=2y), इसलिए (8xy) मिलता है। / ( (u+v)2 -(u-v)2 =4uv ). With (u=x), (v=2y), it gives (8xy).
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( (x-1)(x+1)\(x^2+1\) ) का सरल रूप क्या है?
What is the simplified form of ( (x-1)(x+1)\(x^2+1\) )?
#successive identities
#difference of squares
#x power
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A \(x^4-1\)
B \(x^4+1\)
C \(x^2-1\)
D \(x^4-2x^2+1\)
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Correct Answer
A. \(x^4-1\)
Explanation
Simple Explanation
पहले ( (x-1)(x+1)=x-2 -1 ) है। फिर ( \(x^2-1\)\(x^2+1\)=x-4 -1 ) होगा। / First ( (x-1)(x+1)=x-2 -1 ). Then ( \(x^2-1\)\(x^2+1\)=x-4 -1 ).
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( (2x+3)2 -(2x+1)2 ) का सरल रूप क्या है?
What is the simplified form of ( (2x+3)2 -(2x+1)2 )?
#difference of squares
#expression difference
#simplification
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A (8x+8)
B (4x+4)
C (8x+4)
D (4)
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Explanation
Simple Explanation
इसे (A-2 -B-2 =(A+B)(A-B)) मानें। यहाँ (A-B=2) और (A+B=4x+4), इसलिए (8x+8) है। / Treat it as (A-2 -B-2 =(A+B)(A-B)). Here (A-B=2) and (A+B=4x+4), so it is (8x+8).
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( (3x+5)2 -(3x-1)2 ) का सरल रूप क्या है?
What is the simplified form of ( (3x+5)2 -(3x-1)2 )?
#difference of expressions
#simplification
#algebraic identity
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A (36x+24)
B (18x+24)
C (36x+26)
D (24x+36)
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Correct Answer
A. (36x+24)
Explanation
Simple Explanation
(A-2 -B-2 =(A+B)(A-B)) लगाएँ। (A-B=6) और (A+B=6x+4), इसलिए (36x+24) है। / Use (A-2 -B-2 =(A+B)(A-B)). (A-B=6) and (A+B=6x+4), so the result is (36x+24).
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( (x+a)2 -(x-a)2 =24x ) है। यदि (a=3) हो तो यह कथन किस कारण सही है?
( (x+a)2 -(x-a)2 =24x ). If (a=3), why is this statement correct?
#error analysis
#identity check
#4ax
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A क्योंकि पहचान से (4ax=12x) होता है / Because identity gives (4ax=12x)
B क्योंकि पहचान से (4ax=24x) होता है / Because identity gives (4ax=24x)
C क्योंकि पहचान से (8ax=24x) होता है / Because identity gives (8ax=24x)
D क्योंकि यह हमेशा शून्य होता है / Because it is always zero
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Correct Answer
B. क्योंकि पहचान से (4ax=24x) होता है / Because identity gives (4ax=24x)
Explanation
Simple Explanation
( (x+a)2 -(x-a)2 =4ax ) है। (a=3) रखने पर (12x) मिलेगा, इसलिए दिया कथन सही नहीं है। / ( (x+a)2 -(x-a)2 =4ax ). With (a=3), it gives (12x), so the given statement is not correct.
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( (a+b+c)2 ) में यदि (a+b+c=10) हो तो पूरा मान कितना होगा?
If (a+b+c=10), what is the complete value of ( (a+b+c)2 )?
#three term square
#given sum
#numerical value
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A (20)
B (50)
C (100)
D (10)
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Explanation
Simple Explanation
यदि पूरा योग (10) है तो उसका वर्ग (100) होगा। परीक्षा में दिए गए योग का सीधे वर्ग लें। / If the whole sum is (10), its square is (100). Exam tip: directly square the given sum.
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( (x+2)2 +(x-2)2 -2x-2 ) का सरल रूप क्या है?
What is the simplified form of ( (x+2)2 +(x-2)2 -2x-2 )?
#sum identity
#simplification
#constant result
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A (4)
B (8)
C (4x)
D (8x)
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Explanation
Simple Explanation
पहले योग \(2x^2+8\) है। फिर \(2x^2\) घटाने पर (8) बचता है। / The sum is first \(2x^2+8\). Subtracting \(2x^2\) leaves (8).
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( (x+3y)2 -(x-3y)2 ) का सरल रूप क्या है?
What is the simplified form of ( (x+3y)2 -(x-3y)2 )?
#difference identity
#4uv
#algebraic simplification
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A (6xy)
B (12xy)
C (9xy)
D \(x^2-9y^2\)
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Explanation
Simple Explanation
( (u+v)2 -(u-v)2 =4uv ) है। यहाँ (u=x) और (v=3y), इसलिए (12xy) मिलता है। / ( (u+v)2 -(u-v)2 =4uv ). Here (u=x) and (v=3y), so the result is (12xy).
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\( x^2+6x+9-y^2 \) का सही गुणनखंड रूप कौन सा है?
Which is the correct factor form of \( x^2+6x+9-y^2 \)?
#factorisation
#perfect square
#difference of squares
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A ( (x+3-y)2 )
B ( (x+3)(x-y) )
C ( (x+3+y)(x+3-y) )
D ( (x+y+3)(x-y-3) )
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Correct Answer
C. ( (x+3+y)(x+3-y) )
Explanation
Simple Explanation
पहले (x-2 +6x+9=(x+3)2 ) पहचानें। फिर ( (x+3)2 -y-2 ) पर अंतर के वर्गों की सर्वसमिका लगाएँ। / First identify (x-2 +6x+9=(x+3)2 ). Then apply the difference of squares identity to ( (x+3)2 -y-2 ).
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