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4 results found for "sign change" in Class 10.

Question Hard Mathematics Polynomials Geometrical meaning of the zeroes of a polynomial. Class 10 Level 22

यदि (p(x)=x-2+8x+16) है, तो ग्राफ (x)-अक्ष को किस बिंदु पर स्पर्श करेगा?

If (p(x)=x-2+8x+16), at which point will the graph touch the (x)-axis?

Explanation opens after your attempt
Correct Answer

A. ((-4,0))

Step 1

Concept

(x-2+8x+16=(x+4)2), so the touching point is ((-4,0)). Tip: in a perfect square the sign changes to get the zero.

Step 2

Why this answer is correct

The correct answer is A. ((-4,0)). (x-2+8x+16=(x+4)2), so the touching point is ((-4,0)). Tip: in a perfect square the sign changes to get the zero.

Step 3

Exam Tip

(x-2+8x+16=(x+4)2), इसलिए स्पर्श बिंदु ((-4,0)) है। टिप: पूर्ण वर्ग में चिह्न बदलकर शून्यक मिलता है।

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Question Medium Mathematics Polynomials Geometrical meaning of the zeroes of a polynomial. Class 10 Level 23

यदि (p(-1)>0) और (p(4)<0), तो निरंतर बहुपद आलेख के लिए कौन सा कथन उचित है?

If (p(-1)>0) and (p(4)<0), which statement is suitable for a continuous polynomial graph?

Explanation opens after your attempt
Correct Answer

B. बीच में कम से कम एक (x)-अक्ष कटान हो सकता हैThere may be at least one (x)-axis intersection between them

Step 1

Concept

A sign change suggests (p(x)=0) in between. Tip: a polynomial graph does not break.

Step 2

Why this answer is correct

The correct answer is B. बीच में कम से कम एक (x)-अक्ष कटान हो सकता है / There may be at least one (x)-axis intersection between them. A sign change suggests (p(x)=0) in between. Tip: a polynomial graph does not break.

Step 3

Exam Tip

चिह्न बदलने से बीच में (p(x)=0) होने का संकेत मिलता है। टिप: बहुपद आलेख टूटता नहीं है।

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Question Medium Mathematics Polynomials Geometrical meaning of the zeroes of a polynomial. Class 10 Level 22

यदि (p(2)) धनात्मक और (p(5)) ऋणात्मक है, तो ग्राफ के बारे में कौन सा कथन सबसे उचित है?

If (p(2)) is positive and (p(5)) is negative, which statement about the graph is most appropriate?

Explanation opens after your attempt
Correct Answer

A. ग्राफ (x=2) और (x=5) के बीच (x)-अक्ष को पार कर सकता हैThe graph may cross the (x)-axis between (x=2) and (x=5)

Step 1

Concept

A change of sign indicates a meeting with the (x)-axis in between. Tip: polynomial graphs are continuous.

Step 2

Why this answer is correct

The correct answer is A. ग्राफ (x=2) और (x=5) के बीच (x)-अक्ष को पार कर सकता है / The graph may cross the (x)-axis between (x=2) and (x=5). A change of sign indicates a meeting with the (x)-axis in between. Tip: polynomial graphs are continuous.

Step 3

Exam Tip

चिह्न बदलना बीच में (x)-अक्ष से मिलने का संकेत देता है। टिप: बहुपद के ग्राफ सतत होते हैं।

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Question Hard Mathematics Real Numbers 5: Irrational numbers Class 10 Level 14

यदि (x) एक अपरिमेय संख्या है, तो (-x) के बारे में सही कथन क्या है?

If (x) is an irrational number, which statement about (-x) is correct?

Explanation opens after your attempt
Correct Answer

B. यह हमेशा अपरिमेय हैIt is always irrational

Step 1

Concept

A negative sign changes direction, not rationality.

Step 2

Why this answer is correct

If (-x) were rational, then (x) would also be rational, which is false.

Step 3

Exam Tip

Treat the sign of a number and its type separately. चरण 1: ऋण चिह्न केवल संख्या की दिशा बदलता है, उसकी परिमेयता नहीं। चरण 2: यदि (-x) परिमेय हो, तो (x) भी परिमेय होगा, जो गलत है। चरण 3: संख्या के चिह्न और संख्या की प्रकृति को अलग-अलग समझें।

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