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real-valued-functions MCQ Questions for Class 11

real-valued-functions se related questions ko ek jagah revise karein. Har question me bilingual content, answer feedback aur explanation available hai.

Practice Questions

308 questions tagged with real-valued-functions.

फलन (f(x)=\frac{2}{3+\sqrt{x-2+4}}) का परिसर क्या है?

What is the range of (f(x)=\frac{2}{3+\sqrt{x-2+4}})?

Explanation opens after your attempt
Correct Answer

A. ( \left\(0,\frac{2}{5}\right] \)

Step 1

Concept

Since \(\sqrt{x^2+4}\ge 2\), the denominator is at least (5), so the maximum value is \(\frac{2}{5}\). As \(|x|\to\infty\), the value approaches (0) but never becomes (0).

Step 2

Why this answer is correct

The correct answer is A. ( \left\(0,\frac{2}{5}\right] \). Since \(\sqrt{x^2+4}\ge 2\), the denominator is at least (5), so the maximum value is \(\frac{2}{5}\). As \(|x|\to\infty\), the value approaches (0) but never becomes (0).

Step 3

Exam Tip

\(\sqrt{x^2+4}\ge 2\), इसलिए हर कम से कम (5) है और अधिकतम मान \(\frac{2}{5}\) है। \(|x|\to\infty\) पर मान (0) के पास जाता है पर (0) नहीं होता।

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फलन (f(x)=\sqrt{\log_{\frac{1}{4}}(9-x)}) का प्रांत क्या है?

What is the domain of (f(x)=\sqrt{\log_{\frac{1}{4}}(9-x)})?

Explanation opens after your attempt
Correct Answer

A. ( [8,9) )

Step 1

Concept

The square root needs (\log_{\frac{1}{4}}(9-x)\ge 0) and (9-x>0). Since the base \(\frac{1}{4}<1\), \(0<9-x\le 1\), so the domain is ([8,9)).

Step 2

Why this answer is correct

The correct answer is A. ( [8,9) ). The square root needs (\log_{\frac{1}{4}}(9-x)\ge 0) and (9-x>0). Since the base \(\frac{1}{4}<1\), \(0<9-x\le 1\), so the domain is ([8,9)).

Step 3

Exam Tip

वर्गमूल के लिए (\log_{\frac{1}{4}}(9-x)\ge 0) और (9-x>0) चाहिए। आधार \(\frac{1}{4}<1\) होने से \(0<9-x\le 1\), इसलिए प्रांत ([8,9)) है।

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फलन (f(x)=\log_{2}(5-2x)) का प्रांत क्या है?

What is the domain of (f(x)=\log_{2}(5-2x))?

Explanation opens after your attempt
Correct Answer

A. ( \(-\infty,\frac{5}{2}\) )

Step 1

Concept

The logarithm input must satisfy (5-2x>0). This gives \(x<\frac{5}{2}\).

Step 2

Why this answer is correct

The correct answer is A. ( \(-\infty,\frac{5}{2}\) ). The logarithm input must satisfy (5-2x>0). This gives \(x<\frac{5}{2}\).

Step 3

Exam Tip

लघुगणक के अंदर (5-2x>0) होना चाहिए। इससे \(x<\frac{5}{2}\) मिलता है।

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फलन (f(x)=\sqrt{1-\frac{1}{x-2}}) का परिसर क्या है?

What is the range of (f(x)=\sqrt{1-\frac{1}{x-2}})?

Explanation opens after your attempt
Correct Answer

A. ( [0,1) )

Step 1

Concept

On the domain, \(\frac{1}{x^2}\in(0,1]), so the inside value lies in ([0,1)\). After square root, the range remains ([0,1)).

Step 2

Why this answer is correct

The correct answer is A. ( [0,1) ). On the domain, \(\frac{1}{x^2}\in(0,1]), so the inside value lies in ([0,1)\). After square root, the range remains ([0,1)).

Step 3

Exam Tip

प्रांत में \(\frac{1}{x^2}\in(0,1]), इसलिए अंदर का मान ([0,1)\) में है। वर्गमूल के बाद भी परिसर ([0,1)) रहता है।

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फलन (f(x)=\sqrt{1-\frac{1}{x-2}}) का प्रांत क्या है?

What is the domain of (f(x)=\sqrt{1-\frac{1}{x-2}})?

Explanation opens after your attempt
Correct Answer

A. ( \(-\infty,-1]\cup[1,\infty\) )

Step 1

Concept

The square root needs \(1-\frac{1}{x^2}\ge 0\) and \(x\ne 0\). This gives \(x^2\ge 1\), so \(|x|\ge 1\).

Step 2

Why this answer is correct

The correct answer is A. ( \(-\infty,-1]\cup[1,\infty\) ). The square root needs \(1-\frac{1}{x^2}\ge 0\) and \(x\ne 0\). This gives \(x^2\ge 1\), so \(|x|\ge 1\).

Step 3

Exam Tip

वर्गमूल के लिए \(1-\frac{1}{x^2}\ge 0\) और \(x\ne 0\) चाहिए। इससे \(x^2\ge 1\), यानी \(|x|\ge 1\) मिलता है।

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फलन (f(x)=\frac{\sqrt{x+3}}{\sqrt{2-x}}) का परिसर क्या है?

What is the range of (f(x)=\frac{\sqrt{x+3}}{\sqrt{2-x}})?

Explanation opens after your attempt
Correct Answer

A. \( [0,\infty\) )

Step 1

Concept

The function is \(\sqrt{\frac{x+3}{2-x}}\), where the fraction takes all values in \([0,\infty\)). Hence the square root range is also \([0,\infty\)).

Step 2

Why this answer is correct

The correct answer is A. \( [0,\infty\) ). The function is \(\sqrt{\frac{x+3}{2-x}}\), where the fraction takes all values in \([0,\infty\)). Hence the square root range is also \([0,\infty\)).

Step 3

Exam Tip

फलन \(\sqrt{\frac{x+3}{2-x}}\) है, जहां भिन्न \([0,\infty\)) के सभी मान लेता है। इसलिए वर्गमूल का परिसर भी \([0,\infty\)) है।

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फलन (f(x)=\frac{\sqrt{x+3}}{\sqrt{2-x}}) का प्रांत क्या है?

What is the domain of (f(x)=\frac{\sqrt{x+3}}{\sqrt{2-x}})?

Explanation opens after your attempt
Correct Answer

A. ( [-3,2) )

Step 1

Concept

The numerator square root needs \(x+3\ge 0\), and the denominator square root needs (2-x>0). Hence \(-3\le x<2\).

Step 2

Why this answer is correct

The correct answer is A. ( [-3,2) ). The numerator square root needs \(x+3\ge 0\), and the denominator square root needs (2-x>0). Hence \(-3\le x<2\).

Step 3

Exam Tip

अंश के वर्गमूल के लिए \(x+3\ge 0\) और हर के वर्गमूल के लिए (2-x>0) चाहिए। इसलिए \(-3\le x<2\)।

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फलन (f(x)=\sqrt{\frac{x-2-1}{4-x-2}}) का प्रांत क्या है?

What is the domain of (f(x)=\sqrt{\frac{x-2-1}{4-x-2}})?

Explanation opens after your attempt
Correct Answer

B. ( \(-2,-1]\cup[1,2\) )

Step 1

Concept

The square root needs \(\frac{x^2-1}{4-x^2}\ge 0\) and \(x\ne\pm2\). A sign check gives (\(-2,-1]\cup[1,2\)).

Step 2

Why this answer is correct

The correct answer is B. ( \(-2,-1]\cup[1,2\) ). The square root needs \(\frac{x^2-1}{4-x^2}\ge 0\) and \(x\ne\pm2\). A sign check gives (\(-2,-1]\cup[1,2\)).

Step 3

Exam Tip

वर्गमूल के अंदर \(\frac{x^2-1}{4-x^2}\ge 0\) और \(x\ne\pm2\) चाहिए। संकेत जांच से (\(-2,-1]\cup[1,2\)) मिलता है।

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फलन (f(x)=\sqrt{\frac{9-x-2}{x-2-4}}) का प्रांत क्या है?

What is the domain of (f(x)=\sqrt{\frac{9-x-2}{x-2-4}})?

Explanation opens after your attempt
Correct Answer

B. ( [-3,-2)\cup(2,3] )

Step 1

Concept

The square root needs \(\frac{9-x^2}{x^2-4}\ge 0\) and \(x\ne\pm2\). A sign check gives ([-3,-2)\cup(2,3]).

Step 2

Why this answer is correct

The correct answer is B. ( [-3,-2)\cup(2,3] ). The square root needs \(\frac{9-x^2}{x^2-4}\ge 0\) and \(x\ne\pm2\). A sign check gives ([-3,-2)\cup(2,3]).

Step 3

Exam Tip

वर्गमूल के अंदर \(\frac{9-x^2}{x^2-4}\ge 0\) और \(x\ne\pm2\) चाहिए। संकेत जांच से ([-3,-2)\cup(2,3]) मिलता है।

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फलन (f(x)=\frac{x-2+9}{3x}) का परिसर क्या है?

What is the range of (f(x)=\frac{x-2+9}{3x})?

Explanation opens after your attempt
Correct Answer

A. ( \(-\infty,-2]\cup[2,\infty\) )

Step 1

Concept

Here (f(x)=\frac{x}{3}+\frac{3}{x}). For positive (x), the minimum is (2), and for negative (x), the maximum is (-2).

Step 2

Why this answer is correct

The correct answer is A. ( \(-\infty,-2]\cup[2,\infty\) ). Here (f(x)=\frac{x}{3}+\frac{3}{x}). For positive (x), the minimum is (2), and for negative (x), the maximum is (-2).

Step 3

Exam Tip

(f(x)=\frac{x}{3}+\frac{3}{x}) है। धनात्मक (x) पर न्यूनतम (2) और ऋणात्मक (x) पर अधिकतम (-2) मिलता है।

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फलन (f(x)=\frac{x-2+1}{x}) का परिसर क्या है?

What is the range of (f(x)=\frac{x-2+1}{x})?

Explanation opens after your attempt
Correct Answer

A. ( \(-\infty,-2]\cup[2,\infty\) )

Step 1

Concept

Here (f(x)=x+\frac{1}{x}). For (x>0), values are \([2,\infty\)), and for (x<0), values are (\(-\infty,-2]\).

Step 2

Why this answer is correct

The correct answer is A. ( \(-\infty,-2]\cup[2,\infty\) ). Here (f(x)=x+\frac{1}{x}). For (x>0), values are \([2,\infty\)), and for (x<0), values are (\(-\infty,-2]\).

Step 3

Exam Tip

(f(x)=x+\frac{1}{x}) है। (x>0) पर मान \([2,\infty\)) और (x<0) पर (\(-\infty,-2]\) मिलते हैं।

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फलन (f(x)=\frac{x-2}{\sqrt{x-2-4x+8}}) का परिसर क्या है?

What is the range of (f(x)=\frac{x-2}{\sqrt{x-2-4x+8}})?

Explanation opens after your attempt
Correct Answer

A. ( (-1,1) )

Step 1

Concept

The denominator is (\sqrt{(x-2)2+4}), which is greater than (|x-2|). Hence the ratio stays strictly between (-1) and (1).

Step 2

Why this answer is correct

The correct answer is A. ( (-1,1) ). The denominator is (\sqrt{(x-2)2+4}), which is greater than (|x-2|). Hence the ratio stays strictly between (-1) and (1).

Step 3

Exam Tip

हर (\sqrt{(x-2)2+4}) है, जो (|x-2|) से बड़ा है। इसलिए अनुपात का मान (-1) और (1) के बीच ही रहता है।

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फलन (f(x)=\frac{x}{\sqrt{x-2+9}}) का परिसर क्या है?

What is the range of (f(x)=\frac{x}{\sqrt{x-2+9}})?

Explanation opens after your attempt
Correct Answer

A. ( (-1,1) )

Step 1

Concept

The denominator is always greater than (|x|), so \(\left|\frac{x}{\sqrt{x^2+9}}\right|<1\). For large (|x|), the value approaches \(\pm 1\) but never equals them.

Step 2

Why this answer is correct

The correct answer is A. ( (-1,1) ). The denominator is always greater than (|x|), so \(\left|\frac{x}{\sqrt{x^2+9}}\right|<1\). For large (|x|), the value approaches \(\pm 1\) but never equals them.

Step 3

Exam Tip

हर हमेशा (|x|) से बड़ा है, इसलिए \(\left|\frac{x}{\sqrt{x^2+9}}\right|<1\)। बड़े (|x|) पर मान \(\pm 1\) के पास जाता है पर बराबर नहीं होता।

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फलन (f(x)=\frac{1}{2+\sqrt{x-2+1}}) का परिसर क्या है?

What is the range of (f(x)=\frac{1}{2+\sqrt{x-2+1}})?

Explanation opens after your attempt
Correct Answer

A. ( \(0,\frac{1}{3}] \)

Step 1

Concept

Since \(\sqrt{x^2+1}\ge 1\), the denominator is at least (3). The maximum is \(\frac{1}{3}\), and the value approaches (0).

Step 2

Why this answer is correct

The correct answer is A. ( \(0,\frac{1}{3}] \). Since \(\sqrt{x^2+1}\ge 1\), the denominator is at least (3). The maximum is \(\frac{1}{3}\), and the value approaches (0).

Step 3

Exam Tip

\(\sqrt{x^2+1}\ge 1\), इसलिए हर कम से कम (3) है। अधिकतम \(\frac{1}{3}\) है और मान (0) के पास जाता है।

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यदि (f(x)=\lceil 3x\rceil) और (x\in(0,1]), तो (f) का परिसर क्या है?

If (f(x)=\lceil 3x\rceil) and (x\in(0,1]), what is the range of (f)?

Explanation opens after your attempt
Correct Answer

A. ( {1,2,3} )

Step 1

Concept

Since (3x\in(0,3]), the ceiling function values are (1,2,3). The value (0) does not occur because (x>0).

Step 2

Why this answer is correct

The correct answer is A. ( {1,2,3} ). Since (3x\in(0,3]), the ceiling function values are (1,2,3). The value (0) does not occur because (x>0).

Step 3

Exam Tip

(3x\in(0,3]), इसलिए छत फलन के मान (1,2,3) होंगे। (0) नहीं आता क्योंकि (x>0) है।

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यदि (f(x)={2x}) भिन्नांश फलन है और \(x\in\mathbb{R}\), तो परिसर क्या है?

If (f(x)={2x}) is the fractional part function and \(x\in\mathbb{R}\), what is the range?

Explanation opens after your attempt
Correct Answer

A. ( [0,1) )

Step 1

Concept

The fractional part of any real number is at least (0) and less than (1). When (2x) is an integer, the value is (0).

Step 2

Why this answer is correct

The correct answer is A. ( [0,1) ). The fractional part of any real number is at least (0) and less than (1). When (2x) is an integer, the value is (0).

Step 3

Exam Tip

किसी भी वास्तविक संख्या का भिन्नांश भाग (0) से बड़ा या बराबर और (1) से छोटा होता है। (2x) पूर्णांक होने पर मान (0) मिलता है।

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यदि (f(x)=\lfloor x+2\rfloor) और \(x\in[-1,3\)), तो (f) का परिसर क्या है?

If (f(x)=\lfloor x+2\rfloor) and \(x\in[-1,3\)), what is the range of (f)?

Explanation opens after your attempt
Correct Answer

A. ( {1,2,3,4} )

Step 1

Concept

Here \(x+2\in[1,5\)), so the greatest integer values are (1,2,3,4). The value (5) does not occur because the upper endpoint is open.

Step 2

Why this answer is correct

The correct answer is A. ( {1,2,3,4} ). Here \(x+2\in[1,5\)), so the greatest integer values are (1,2,3,4). The value (5) does not occur because the upper endpoint is open.

Step 3

Exam Tip

\(x+2\in[1,5\)), इसलिए महत्तम पूर्णांक मान (1,2,3,4) होंगे। (5) नहीं आता क्योंकि ऊपरी सिरा खुला है।

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फलन (f(x)=\sqrt{\cos x}) का प्रांत क्या है, जब \(x\in[0,2\pi]\)?

What is the domain of (f(x)=\sqrt{\cos x}) when \(x\in[0,2\pi]\)?

Explanation opens after your attempt
Correct Answer

A. \( \left[0,\frac{\pi}{2}\right]\cup\left[\frac{3\pi}{2},2\pi\right] \)

Step 1

Concept

The square root needs \(\cos x\ge 0\). In \([0,2\pi]\), this is true in the first and fourth quadrants.

Step 2

Why this answer is correct

The correct answer is A. \( \left[0,\frac{\pi}{2}\right]\cup\left[\frac{3\pi}{2},2\pi\right] \). The square root needs \(\cos x\ge 0\). In \([0,2\pi]\), this is true in the first and fourth quadrants.

Step 3

Exam Tip

वर्गमूल के लिए \(\cos x\ge 0\) चाहिए। \([0,2\pi]\) में यह पहले और चौथे चतुर्थांश में सत्य है।

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फलन (f(x)=\sqrt{\sin x}) का प्रांत क्या है, जब \(x\in[0,2\pi]\)?

What is the domain of (f(x)=\sqrt{\sin x}) when \(x\in[0,2\pi]\)?

Explanation opens after your attempt
Correct Answer

A. \( [0,\pi] \)

Step 1

Concept

The square root needs \(\sin x\ge 0\). In the interval \([0,2\pi]\), this is true on \([0,\pi]\).

Step 2

Why this answer is correct

The correct answer is A. \( [0,\pi] \). The square root needs \(\sin x\ge 0\). In the interval \([0,2\pi]\), this is true on \([0,\pi]\).

Step 3

Exam Tip

वर्गमूल के लिए \(\sin x\ge 0\) चाहिए। अंतराल \([0,2\pi]\) में यह \([0,\pi]\) पर सत्य है।

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फलन (f(x)=3-2\cos x) का परिसर क्या है?

What is the range of (f(x)=3-2\cos x)?

Explanation opens after your attempt
Correct Answer

A. ( [1,5] )

Step 1

Concept

Since \(\cos x\in[-1,1]\), \(-2\cos x\in[-2,2]\). Adding (3) gives the range ([1,5]).

Step 2

Why this answer is correct

The correct answer is A. ( [1,5] ). Since \(\cos x\in[-1,1]\), \(-2\cos x\in[-2,2]\). Adding (3) gives the range ([1,5]).

Step 3

Exam Tip

\(\cos x\in[-1,1]\), इसलिए \(-2\cos x\in[-2,2]\)। (3) जोड़ने से परिसर ([1,5]) मिलता है।

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फलन (f(x)=2+\sin x) का परिसर क्या है?

What is the range of (f(x)=2+\sin x)?

Explanation opens after your attempt
Correct Answer

A. ( [1,3] )

Step 1

Concept

Since \(\sin x\in[-1,1]\), \(2+\sin x\in[1,3]\). Under vertical shift, the range shifts by the same amount.

Step 2

Why this answer is correct

The correct answer is A. ( [1,3] ). Since \(\sin x\in[-1,1]\), \(2+\sin x\in[1,3]\). Under vertical shift, the range shifts by the same amount.

Step 3

Exam Tip

\(\sin x\in[-1,1]\), इसलिए \(2+\sin x\in[1,3]\)। ऊर्ध्व स्थानांतरण में परिसर भी उतना ही खिसकता है।

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फलन (f(x)=\frac{1}{1+\sin x}) का प्रांत क्या है?

What is the domain of (f(x)=\frac{1}{1+\sin x})?

Explanation opens after your attempt
Correct Answer

A. \( \mathbb{R}\setminus\left{\frac{3\pi}{2}+2n\pi:n\in\mathbb{Z}\right} \)

Step 1

Concept

The denominator must not be zero, so \(1+\sin x\ne 0\). When \(\sin x=-1\), \(x=\frac{3\pi}{2}+2n\pi\) is excluded.

Step 2

Why this answer is correct

The correct answer is A. \( \mathbb{R}\setminus\left{\frac{3\pi}{2}+2n\pi:n\in\mathbb{Z}\right} \). The denominator must not be zero, so \(1+\sin x\ne 0\). When \(\sin x=-1\), \(x=\frac{3\pi}{2}+2n\pi\) is excluded.

Step 3

Exam Tip

हर शून्य नहीं होना चाहिए, इसलिए \(1+\sin x\ne 0\)। \(\sin x=-1\) पर \(x=\frac{3\pi}{2}+2n\pi\) हटेगा।

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फलन (f(x)=\cos x) का परिसर क्या है, जब \(x\in\left[0,\pi\right]\)?

What is the range of (f(x)=\cos x) when \(x\in\left[0,\pi\right]\)?

Explanation opens after your attempt
Correct Answer

A. ( [-1,1] )

Step 1

Concept

On this interval, \(\cos x\) decreases from (1) to (-1). Therefore the range is ([-1,1]).

Step 2

Why this answer is correct

The correct answer is A. ( [-1,1] ). On this interval, \(\cos x\) decreases from (1) to (-1). Therefore the range is ([-1,1]).

Step 3

Exam Tip

\(\cos x\) इस अंतराल पर (1) से (-1) तक घटता है। इसलिए परिसर ([-1,1]) है।

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फलन (f(x)=\sin x) का परिसर क्या है, जब \(x\in\left[0,\frac{3\pi}{2}\right]\)?

What is the range of (f(x)=\sin x) when \(x\in\left[0,\frac{3\pi}{2}\right]\)?

Explanation opens after your attempt
Correct Answer

A. ( [-1,1] )

Step 1

Concept

In the given interval, \(\sin x\) attains both maximum (1) and minimum (-1). For trigonometric ranges, check key angles.

Step 2

Why this answer is correct

The correct answer is A. ( [-1,1] ). In the given interval, \(\sin x\) attains both maximum (1) and minimum (-1). For trigonometric ranges, check key angles.

Step 3

Exam Tip

दिए गए अंतराल में \(\sin x\) का अधिकतम (1) और न्यूनतम (-1) दोनों आते हैं। त्रिकोणमितीय परिसर के लिए प्रमुख कोणों की जांच करें।

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फलन (f(x)=\frac{\sqrt{25-x-2}}{x-3}) का प्रांत क्या है?

What is the domain of (f(x)=\frac{\sqrt{25-x-2}}{x-3})?

Explanation opens after your attempt
Correct Answer

A. \( [-5,5]\setminus{3} \)

Step 1

Concept

The square root needs \(25-x^2\ge 0\), so \(-5\le x\le 5\). The denominator removes (x=3).

Step 2

Why this answer is correct

The correct answer is A. \( [-5,5]\setminus{3} \). The square root needs \(25-x^2\ge 0\), so \(-5\le x\le 5\). The denominator removes (x=3).

Step 3

Exam Tip

वर्गमूल के लिए \(25-x^2\ge 0\), यानी \(-5\le x\le 5\) चाहिए। हर के कारण (x=3) हटेगा।

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फलन (f(x)=\frac{1}{\sqrt{x+2}}+\sqrt{6-x}) का प्रांत क्या है?

What is the domain of (f(x)=\frac{1}{\sqrt{x+2}}+\sqrt{6-x})?

Explanation opens after your attempt
Correct Answer

A. ( (-2,6] )

Step 1

Concept

The denominator square root needs (x+2>0), and the second square root needs \(6-x\ge 0\). Therefore \(-2<x\le 6\).

Step 2

Why this answer is correct

The correct answer is A. ( (-2,6] ). The denominator square root needs (x+2>0), and the second square root needs \(6-x\ge 0\). Therefore \(-2<x\le 6\).

Step 3

Exam Tip

हर वाले वर्गमूल के लिए (x+2>0) और दूसरे वर्गमूल के लिए \(6-x\ge 0\) चाहिए। इसलिए \(-2<x\le 6\)।

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फलन (f(x)=\sqrt{x-2}+\sqrt{7-x}) का परिसर क्या है?

What is the range of (f(x)=\sqrt{x-2}+\sqrt{7-x})?

Explanation opens after your attempt
Correct Answer

A. \( [\sqrt{5},\sqrt{10}] \)

Step 1

Concept

At the endpoints the value is \(\sqrt{5}\), and at the midpoint \(x=\frac{9}{2}\), the maximum is \(\sqrt{10}\). In symmetric questions, always check the midpoint.

Step 2

Why this answer is correct

The correct answer is A. \( [\sqrt{5},\sqrt{10}] \). At the endpoints the value is \(\sqrt{5}\), and at the midpoint \(x=\frac{9}{2}\), the maximum is \(\sqrt{10}\). In symmetric questions, always check the midpoint.

Step 3

Exam Tip

सिरों पर मान \(\sqrt{5}\) और मध्य \(x=\frac{9}{2}\) पर अधिकतम \(\sqrt{10}\) है। सममिति वाले प्रश्नों में मध्य बिंदु जरूर जांचें।

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फलन (f(x)=\sqrt{x-2}+\sqrt{7-x}) का प्रांत क्या है?

What is the domain of (f(x)=\sqrt{x-2}+\sqrt{7-x})?

Explanation opens after your attempt
Correct Answer

A. ( [2,7] )

Step 1

Concept

Both square roots need \(x-2\ge 0\) and \(7-x\ge 0\). Hence \(2\le x\le 7\).

Step 2

Why this answer is correct

The correct answer is A. ( [2,7] ). Both square roots need \(x-2\ge 0\) and \(7-x\ge 0\). Hence \(2\le x\le 7\).

Step 3

Exam Tip

दोनों वर्गमूलों के लिए \(x-2\ge 0\) और \(7-x\ge 0\) चाहिए। इसलिए \(2\le x\le 7\)।

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फलन (f(x)=\frac{x-2+4x+8}{x-2+4}) का परिसर क्या है?

What is the range of (f(x)=\frac{x-2+4x+8}{x-2+4})?

Explanation opens after your attempt
Correct Answer

A. ( [0,2] )

Step 1

Concept

From \(y=\frac{x^2+4x+8}{x^2+4}\), real (x) is required in ((y-1)x-2-4x+4y-8=0). The discriminant condition (16-4(y-1)(4y-8)\ge 0) gives \(0\le y\le 2\).

Step 2

Why this answer is correct

The correct answer is A. ( [0,2] ). From \(y=\frac{x^2+4x+8}{x^2+4}\), real (x) is required in ((y-1)x-2-4x+4y-8=0). The discriminant condition (16-4(y-1)(4y-8)\ge 0) gives \(0\le y\le 2\).

Step 3

Exam Tip

\(y=\frac{x^2+4x+8}{x^2+4}\) से ((y-1)x-2-4x+4y-8=0) में वास्तविक (x) चाहिए। विविक्तकर (16-4(y-1)(4y-8)\ge 0) से \(0\le y\le 2\) मिलता है।

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फलन (f(x)=\frac{x-2}{x-2+4x+8}) का परिसर क्या है?

What is the range of (f(x)=\frac{x-2}{x-2+4x+8})?

Explanation opens after your attempt
Correct Answer

A. \( [0,\infty\) )

Step 1

Concept

From \(y=\frac{x^2}{x^2+4x+8}\), real (x) is needed in ((y-1)x-2+4yx+8y=0). The discriminant gives \(0\le y\le 2\), and (y=1) is also possible, so the range is ([0,2]).

Step 2

Why this answer is correct

The correct answer is A. \( [0,\infty\) ). From \(y=\frac{x^2}{x^2+4x+8}\), real (x) is needed in ((y-1)x-2+4yx+8y=0). The discriminant gives \(0\le y\le 2\), and (y=1) is also possible, so the range is ([0,2]).

Step 3

Exam Tip

\(y=\frac{x^2}{x^2+4x+8}\) से ((y-1)x-2+4yx+8y=0) में वास्तविक (x) चाहिए। विविक्तकर (16y-2-32y(y-1)=16y(2-y)) से \(0\le y\le 2\), पर (y=1) भी संभव है, इसलिए विस्तृत जांच से ([0,2]) मिलता है।

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