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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{1}{x-2+4x+8}) का परिसर क्या है?

What is the range of (f(x)=\frac{1}{x-2+4x+8})?

Explanation opens after your attempt
Correct Answer

A. ( \(0,\frac{1}{4}] \)

Step 1

Concept

The denominator ((x+2)2+4\ge 4), so the maximum value is \(\frac{1}{4}\). As the denominator grows, the value approaches (0).

Step 2

Why this answer is correct

The correct answer is A. ( \(0,\frac{1}{4}] \). The denominator ((x+2)2+4\ge 4), so the maximum value is \(\frac{1}{4}\). As the denominator grows, the value approaches (0).

Step 3

Exam Tip

हर ((x+2)2+4\ge 4) है, इसलिए अधिकतम मान \(\frac{1}{4}\) है। हर असीम होने पर मान (0) के पास जाता है।

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यदि (f(x)=-x-2+6x-5), तो (f) का परिसर क्या है?

If (f(x)=-x-2+6x-5), what is the range of (f)?

Explanation opens after your attempt
Correct Answer

A. ( \(-\infty,4] \)

Step 1

Concept

\(Here (f(x)=-(x-3)^2+4), so the maximum is (4). A downward-opening parabola has range ((-\infty\),maximum]).

Step 2

Why this answer is correct

\(The correct answer is A. ( (-\infty,4] ). Here (f(x)=-(x-3)^2+4), so the maximum is (4). A downward-opening parabola has range ((-\infty\),maximum]).

Step 3

Exam Tip

(f(x)=-(x-3)2+4), इसलिए अधिकतम (4) है। \(नीचे खुलने वाले परवलय का परिसर ((-\infty\),अधिकतम]) होता है।

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यदि (f(x)=x-2-8x+20) का परिसर \([m,\infty\)) है, तो (m) क्या है?

If the range of (f(x)=x-2-8x+20) is \([m,\infty\)), what is (m)?

Explanation opens after your attempt
Correct Answer

A. (4)

Step 1

Concept

Since (x-2-8x+20=(x-4)2+4), the minimum is (4). Therefore (m=4).

Step 2

Why this answer is correct

The correct answer is A. (4). Since (x-2-8x+20=(x-4)2+4), the minimum is (4). Therefore (m=4).

Step 3

Exam Tip

(x-2-8x+20=(x-4)2+4), इसलिए न्यूनतम (4) है। अतः (m=4) होगा।

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यदि (f(x)=ax-2-3) का परिसर (\(-\infty,-3]\) है, तो (a) के लिए सही शर्त क्या है?

If the range of (f(x)=ax-2-3) is (\(-\infty,-3]\), which condition on (a) is correct?

Explanation opens after your attempt
Correct Answer

A. (a<0)

Step 1

Concept

Only a downward-opening parabola makes (-3) the maximum. Therefore (a<0) is required.

Step 2

Why this answer is correct

The correct answer is A. (a<0). Only a downward-opening parabola makes (-3) the maximum. Therefore (a<0) is required.

Step 3

Exam Tip

नीचे खुलने वाला परवलय ही (-3) को अधिकतम बनाता है। इसलिए (a<0) होना चाहिए।

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यदि (f(x)=\frac{1}{x-2-k}) का प्रांत \(\mathbb{R}\setminus{-5,5}\) है, तो (k) क्या है?

If the domain of (f(x)=\frac{1}{x-2-k}) is \(\mathbb{R}\setminus{-5,5}\), what is (k)?

Explanation opens after your attempt
Correct Answer

A. (25)

Step 1

Concept

The denominator becomes zero when \(x^2=k\). The excluded values are \(\pm 5\), so (k=25).

Step 2

Why this answer is correct

The correct answer is A. (25). The denominator becomes zero when \(x^2=k\). The excluded values are \(\pm 5\), so (k=25).

Step 3

Exam Tip

हर शून्य तब होगा जब \(x^2=k\)। हटे हुए मान \(\pm 5\) हैं, इसलिए (k=25)।

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यदि (f(x)=\sqrt{x+b}) का प्रांत \([-6,\infty\)) है, तो (b) का मान क्या है?

If the domain of (f(x)=\sqrt{x+b}) is \([-6,\infty\)), what is the value of (b)?

Explanation opens after your attempt
Correct Answer

A. (6)

Step 1

Concept

For \(\sqrt{x+b}\), \(x+b\ge 0\), so \(x\ge -b\). Comparing with the given domain, (-b=-6), hence (b=6).

Step 2

Why this answer is correct

The correct answer is A. (6). For \(\sqrt{x+b}\), \(x+b\ge 0\), so \(x\ge -b\). Comparing with the given domain, (-b=-6), hence (b=6).

Step 3

Exam Tip

\(\sqrt{x+b}\) के लिए \(x+b\ge 0\), यानी \(x\ge -b\)। दिए गए प्रांत से (-b=-6), इसलिए (b=6)।

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फलन (f(x)=\frac{x-2-16}{x-4}) का परिसर क्या है?

What is the range of (f(x)=\frac{x-2-16}{x-4})?

Explanation opens after your attempt
Correct Answer

A. \( \mathbb{R}\setminus{8} \)

Step 1

Concept

For \(x\ne 4\), the function equals (x+4). The value (8), which would come from (x=4), will not be in the range.

Step 2

Why this answer is correct

The correct answer is A. \( \mathbb{R}\setminus{8} \). For \(x\ne 4\), the function equals (x+4). The value (8), which would come from (x=4), will not be in the range.

Step 3

Exam Tip

\(x\ne 4\) पर फलन (x+4) के बराबर है। (x=4) से आने वाला मान (8) परिसर में नहीं आएगा।

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फलन (f(x)=\frac{x-2-16}{x-4}) का प्रांत क्या है?

What is the domain of (f(x)=\frac{x-2-16}{x-4})?

Explanation opens after your attempt
Correct Answer

A. \( \mathbb{R}\setminus{4} \)

Step 1

Concept

The original denominator is (x-4), so (x=4) is not allowed. Even after simplification, do not add the removed point to the domain.

Step 2

Why this answer is correct

The correct answer is A. \( \mathbb{R}\setminus{4} \). The original denominator is (x-4), so (x=4) is not allowed. Even after simplification, do not add the removed point to the domain.

Step 3

Exam Tip

मूल हर (x-4) है, इसलिए (x=4) स्वीकार्य नहीं है। सरलीकरण के बाद भी हटे बिंदु को प्रांत में न जोड़ें।

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

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

Explanation opens after your attempt
Correct Answer

A. \( \mathbb{R}\setminus{3,5} \)

Step 1

Concept

The denominator must not be zero, so \(|x-4|-1\ne 0\). This gives \(|x-4|\ne 1\), hence \(x\ne 3,5\).

Step 2

Why this answer is correct

The correct answer is A. \( \mathbb{R}\setminus{3,5} \). The denominator must not be zero, so \(|x-4|-1\ne 0\). This gives \(|x-4|\ne 1\), hence \(x\ne 3,5\).

Step 3

Exam Tip

हर शून्य नहीं होना चाहिए, इसलिए \(|x-4|-1\ne 0\)। इससे \(|x-4|\ne 1\), अतः \(x\ne 3,5\)।

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फलन (f(x)=|3x+2|-6) का परिसर क्या है?

What is the range of (f(x)=|3x+2|-6)?

Explanation opens after your attempt
Correct Answer

A. \( [-6,\infty\) )

Step 1

Concept

Since \(|3x+2|\ge 0\), the least value is (-6). It occurs when (3x+2=0).

Step 2

Why this answer is correct

The correct answer is A. \( [-6,\infty\) ). Since \(|3x+2|\ge 0\), the least value is (-6). It occurs when (3x+2=0).

Step 3

Exam Tip

\(|3x+2|\ge 0\), इसलिए सबसे छोटा मान (-6) है। यह तब मिलता है जब (3x+2=0)।

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

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

Explanation opens after your attempt
Correct Answer

A. ( \(-\infty,-7]\cup[3,\infty\) )

Step 1

Concept

The square root needs \(|x+2|-5\ge 0\). Hence \(|x+2|\ge 5\), giving \(x\le -7\) or \(x\ge 3\).

Step 2

Why this answer is correct

The correct answer is A. ( \(-\infty,-7]\cup[3,\infty\) ). The square root needs \(|x+2|-5\ge 0\). Hence \(|x+2|\ge 5\), giving \(x\le -7\) or \(x\ge 3\).

Step 3

Exam Tip

वर्गमूल के लिए \(|x+2|-5\ge 0\) चाहिए। इसलिए \(|x+2|\ge 5\), जिससे \(x\le -7\) या \(x\ge 3\) मिलता है।

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

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

Explanation opens after your attempt
Correct Answer

A. ( [0,1) )

Step 1

Concept

Put \(t=\sqrt{x-1}\ge 0\), then \(f=\frac{t}{t+4}\). At (t=0), the value is (0), and as \(t\to\infty\), it approaches (1).

Step 2

Why this answer is correct

The correct answer is A. ( [0,1) ). Put \(t=\sqrt{x-1}\ge 0\), then \(f=\frac{t}{t+4}\). At (t=0), the value is (0), and as \(t\to\infty\), it approaches (1).

Step 3

Exam Tip

\(t=\sqrt{x-1}\ge 0\) रखने पर \(f=\frac{t}{t+4}\)। (t=0) पर (0) मिलता है और \(t\to\infty\) पर मान (1) के पास जाता है।

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फलन (f(x)=\log_{\frac{1}{3}}(x+2)) का परिसर क्या है?

What is the range of (f(x)=\log_{\frac{1}{3}}(x+2))?

Explanation opens after your attempt
Correct Answer

A. \( \mathbb{R} \)

Step 1

Concept

A logarithmic function has all real numbers as range when its argument can take all positive values. The base \(\frac{1}{3}\) only changes direction, not the range.

Step 2

Why this answer is correct

The correct answer is A. \( \mathbb{R} \). A logarithmic function has all real numbers as range when its argument can take all positive values. The base \(\frac{1}{3}\) only changes direction, not the range.

Step 3

Exam Tip

लघुगणकीय फलन का परिसर सभी वास्तविक संख्याएं होता है जब उसका आर्गुमेंट सभी धनात्मक मान ले सकता है। आधार \(\frac{1}{3}\) केवल दिशा बदलता है, परिसर नहीं।

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फलन (f(x)=\log_{3}\(x^2-9\)) का प्रांत क्या है?

What is the domain of (f(x)=\log_{3}\(x^2-9\))?

Explanation opens after your attempt
Correct Answer

A. ( \(-\infty,-3\)\cup\(3,\infty\) )

Step 1

Concept

The logarithm input must satisfy \(x^2-9>0\). This gives (|x|>3), so (x<-3) or (x>3).

Step 2

Why this answer is correct

The correct answer is A. ( \(-\infty,-3\)\cup\(3,\infty\) ). The logarithm input must satisfy \(x^2-9>0\). This gives (|x|>3), so (x<-3) or (x>3).

Step 3

Exam Tip

लघुगणक के अंदर \(x^2-9>0\) होना चाहिए। इससे (|x|>3), यानी (x<-3) या (x>3) मिलता है।

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फलन (f(x)=\frac{x-2+5}{x-2+2}) का परिसर क्या है?

What is the range of (f(x)=\frac{x-2+5}{x-2+2})?

Explanation opens after your attempt
Correct Answer

A. ( \(1,\frac{5}{2}] \)

Step 1

Concept

Put \(t=x^2\ge 0\), then \(f=\frac{t+5}{t+2}=1+\frac{3}{t+2}\). The maximum is \(\frac{5}{2}\), and (1) is only a limiting value.

Step 2

Why this answer is correct

The correct answer is A. ( \(1,\frac{5}{2}] \). Put \(t=x^2\ge 0\), then \(f=\frac{t+5}{t+2}=1+\frac{3}{t+2}\). The maximum is \(\frac{5}{2}\), and (1) is only a limiting value.

Step 3

Exam Tip

\(t=x^2\ge 0\) रखने पर \(f=\frac{t+5}{t+2}=1+\frac{3}{t+2}\)। अधिकतम \(\frac{5}{2}\) है और (1) केवल सीमा मान है।

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फलन (f(x)=\frac{1}{\sqrt{x-2-2x-8}}) का प्रांत क्या है?

What is the domain of (f(x)=\frac{1}{\sqrt{x-2-2x-8}})?

Explanation opens after your attempt
Correct Answer

A. ( \(-\infty,-2\)\cup\(4,\infty\) )

Step 1

Concept

The square root is in the denominator, so \(x^2-2x-8>0\) is required. From ((x-4)(x+2)>0), the outer open intervals are obtained.

Step 2

Why this answer is correct

The correct answer is A. ( \(-\infty,-2\)\cup\(4,\infty\) ). The square root is in the denominator, so \(x^2-2x-8>0\) is required. From ((x-4)(x+2)>0), the outer open intervals are obtained.

Step 3

Exam Tip

हर में वर्गमूल है, इसलिए \(x^2-2x-8>0\) चाहिए। ((x-4)(x+2)>0) से बाहरी खुले अंतराल मिलते हैं।

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फलन (f(x)=\sqrt{12-x-x-2}) का परिसर क्या है?

What is the range of (f(x)=\sqrt{12-x-x-2})?

Explanation opens after your attempt
Correct Answer

A. \( [0,\frac{7}{2}] \)

Step 1

Concept

Since (12-x-x-2=\frac{49}{4}-\left\(x+\frac{1}{2}\right\)2), the inside maximum is \(\frac{49}{4}\). Taking square root gives maximum \(\frac{7}{2}\).

Step 2

Why this answer is correct

The correct answer is A. \( [0,\frac{7}{2}] \). Since (12-x-x-2=\frac{49}{4}-\left\(x+\frac{1}{2}\right\)2), the inside maximum is \(\frac{49}{4}\). Taking square root gives maximum \(\frac{7}{2}\).

Step 3

Exam Tip

(12-x-x-2=\frac{49}{4}-\left\(x+\frac{1}{2}\right\)2), इसलिए अंदर का अधिकतम \(\frac{49}{4}\) है। वर्गमूल से अधिकतम \(\frac{7}{2}\) मिलता है।

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फलन (f(x)=\sqrt{12-x-x-2}) का प्रांत क्या है?

What is the domain of (f(x)=\sqrt{12-x-x-2})?

Explanation opens after your attempt
Correct Answer

A. ( [-4,3] )

Step 1

Concept

The square root needs \(12-x-x^2\ge 0\). Writing it as (-(x+4)(x-3)\ge 0) gives \(-4\le x\le 3\).

Step 2

Why this answer is correct

The correct answer is A. ( [-4,3] ). The square root needs \(12-x-x^2\ge 0\). Writing it as (-(x+4)(x-3)\ge 0) gives \(-4\le x\le 3\).

Step 3

Exam Tip

वर्गमूल के लिए \(12-x-x^2\ge 0\) चाहिए। इसे (-(x+4)(x-3)\ge 0) लिखकर \(-4\le x\le 3\) मिलता है।

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फलन (f(x)=\frac{7x+4}{2x-3}) का परिसर क्या है?

What is the range of (f(x)=\frac{7x+4}{2x-3})?

Explanation opens after your attempt
Correct Answer

A. \( \mathbb{R}\setminus{\frac{7}{2}} \)

Step 1

Concept

From \(y=\frac{7x+4}{2x-3}\), \(x=\frac{3y+4}{2y-7}\), so \(y\ne \frac{7}{2}\). In a linear fractional function, remove the impossible (y).

Step 2

Why this answer is correct

The correct answer is A. \( \mathbb{R}\setminus{\frac{7}{2}} \). From \(y=\frac{7x+4}{2x-3}\), \(x=\frac{3y+4}{2y-7}\), so \(y\ne \frac{7}{2}\). In a linear fractional function, remove the impossible (y).

Step 3

Exam Tip

\(y=\frac{7x+4}{2x-3}\) से \(x=\frac{3y+4}{2y-7}\), इसलिए \(y\ne \frac{7}{2}\)। रैखिक भिन्न फलन में असंभव (y) को हटाएं।

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

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

Explanation opens after your attempt
Correct Answer

A. ( \(-\infty,2\)\cup[5,\infty) )

Step 1

Concept

The expression inside the square root must satisfy \(\frac{x-5}{x-2}\ge 0\) and \(x\ne 2\). A sign chart gives (x<2) or \(x\ge 5\).

Step 2

Why this answer is correct

The correct answer is A. ( \(-\infty,2\)\cup[5,\infty) ). The expression inside the square root must satisfy \(\frac{x-5}{x-2}\ge 0\) and \(x\ne 2\). A sign chart gives (x<2) or \(x\ge 5\).

Step 3

Exam Tip

वर्गमूल के अंदर \(\frac{x-5}{x-2}\ge 0\) और \(x\ne 2\) चाहिए। संकेत सारणी से (x<2) या \(x\ge 5\) मिलता है।

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

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

Explanation opens after your attempt
Correct Answer

A. ( (4,5] )

Step 1

Concept

The square root needs (\log_{\frac{1}{2}}(x-4)\ge 0) and (x-4>0). Since the base \(\frac{1}{2}<1\), \(0<x-4\le 1\), so the domain is ((4,5]).

Step 2

Why this answer is correct

The correct answer is A. ( (4,5] ). The square root needs (\log_{\frac{1}{2}}(x-4)\ge 0) and (x-4>0). Since the base \(\frac{1}{2}<1\), \(0<x-4\le 1\), so the domain is ((4,5]).

Step 3

Exam Tip

वर्गमूल के लिए (\log_{\frac{1}{2}}(x-4)\ge 0) और (x-4>0) चाहिए। आधार \(\frac{1}{2}<1\) होने से \(0<x-4\le 1\), इसलिए प्रांत ((4,5]) है।

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यदि (f(x)=x-2+2x+3) का परिसर \([m,\infty\)) है, तो (m) क्या है?

If the range of (f(x)=x-2+2x+3) is \([m,\infty\)), what is (m)?

Explanation opens after your attempt
Correct Answer

B. (2)

Step 1

Concept

Since (x-2+2x+3=(x+1)2+2), the minimum value is (2). Therefore (m=2).

Step 2

Why this answer is correct

The correct answer is B. (2). Since (x-2+2x+3=(x+1)2+2), the minimum value is (2). Therefore (m=2).

Step 3

Exam Tip

(x-2+2x+3=(x+1)2+2), इसलिए न्यूनतम मान (2) है। अतः (m=2) होगा।

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यदि (f(x)=\frac{x-2+4}{x}), तो (f) का परिसर क्या है?

If (f(x)=\frac{x-2+4}{x}), what is the range of (f)?

Explanation opens after your attempt
Correct Answer

A. ( \(-\infty,-4]\cup[4,\infty\) )

Step 1

Concept

Here (f(x)=x+\frac{4}{x}). For (x>0), values are \([4,\infty\)), and for (x<0), values are (\(-\infty,-4]\).

Step 2

Why this answer is correct

The correct answer is A. ( \(-\infty,-4]\cup[4,\infty\) ). Here (f(x)=x+\frac{4}{x}). For (x>0), values are \([4,\infty\)), and for (x<0), values are (\(-\infty,-4]\).

Step 3

Exam Tip

(f(x)=x+\frac{4}{x}) है। (x>0) पर मान \([4,\infty\)) और (x<0) पर (\(-\infty,-4]\) मिलता है।

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फलन (f(x)=\sqrt{x-2-6x+5}) का परिसर क्या है?

What is the range of (f(x)=\sqrt{x-2-6x+5})?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

On the domain, the inside expression starts at (0) and goes to infinity. Hence the square root range is \([0,\infty\)).

Step 2

Why this answer is correct

The correct answer is A. \( [0,\infty\) ). On the domain, the inside expression starts at (0) and goes to infinity. Hence the square root range is \([0,\infty\)).

Step 3

Exam Tip

प्रांत में अंदर का व्यंजक (0) से शुरू होकर असीम तक जाता है। इसलिए वर्गमूल का परिसर \([0,\infty\)) है।

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फलन (f(x)=\sqrt{x-2-6x+5}) का प्रांत क्या है?

What is the domain of (f(x)=\sqrt{x-2-6x+5})?

Explanation opens after your attempt
Correct Answer

A. ( \(-\infty,1]\cup[5,\infty\) )

Step 1

Concept

The square root needs \(x^2-6x+5\ge 0\). From ((x-1)(x-5)\ge 0), the outer intervals are obtained.

Step 2

Why this answer is correct

The correct answer is A. ( \(-\infty,1]\cup[5,\infty\) ). The square root needs \(x^2-6x+5\ge 0\). From ((x-1)(x-5)\ge 0), the outer intervals are obtained.

Step 3

Exam Tip

वर्गमूल के लिए \(x^2-6x+5\ge 0\) चाहिए। ((x-1)(x-5)\ge 0) से बाहरी अंतराल मिलते हैं।

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

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

Explanation opens after your attempt
Correct Answer

A. \( [2,\infty\)\setminus{7} )

Step 1

Concept

The square root needs \(x\ge 2\), and the denominator needs \(x\ne 7\). Hence the domain is \([2,\infty\)\setminus{7}).

Step 2

Why this answer is correct

The correct answer is A. \( [2,\infty\)\setminus{7} ). The square root needs \(x\ge 2\), and the denominator needs \(x\ne 7\). Hence the domain is \([2,\infty\)\setminus{7}).

Step 3

Exam Tip

वर्गमूल के लिए \(x\ge 2\) और हर के लिए \(x\ne 7\) चाहिए। इसलिए प्रांत \([2,\infty\)\setminus{7}) है।

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

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

Explanation opens after your attempt
Correct Answer

A. ( [-5,2) )

Step 1

Concept

The expression inside the square root must satisfy \(\frac{x+5}{2-x}\ge 0\) and \(x\ne 2\). A sign chart gives ([-5,2)).

Step 2

Why this answer is correct

The correct answer is A. ( [-5,2) ). The expression inside the square root must satisfy \(\frac{x+5}{2-x}\ge 0\) and \(x\ne 2\). A sign chart gives ([-5,2)).

Step 3

Exam Tip

वर्गमूल के अंदर \(\frac{x+5}{2-x}\ge 0\) और \(x\ne 2\) चाहिए। संकेत सारणी से ([-5,2)) मिलता है।

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

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

Explanation opens after your attempt
Correct Answer

A. ( (-2,4] )

Step 1

Concept

The square root needs \(\frac{4-x}{x+2}\ge 0\) and \(x\ne -2\). A sign check gives \(-2<x\le 4\).

Step 2

Why this answer is correct

The correct answer is A. ( (-2,4] ). The square root needs \(\frac{4-x}{x+2}\ge 0\) and \(x\ne -2\). A sign check gives \(-2<x\le 4\).

Step 3

Exam Tip

वर्गमूल के अंदर \(\frac{4-x}{x+2}\ge 0\) और \(x\ne -2\) चाहिए। संकेत जांच से \(-2<x\le 4\) मिलता है।

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

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

Explanation opens after your attempt
Correct Answer

A. ( (1,4] )

Step 1

Concept

The denominator square root needs (x-1>0), and the second square root needs \(4-x\ge 0\). Hence \(1<x\le 4\).

Step 2

Why this answer is correct

The correct answer is A. ( (1,4] ). The denominator square root needs (x-1>0), and the second square root needs \(4-x\ge 0\). Hence \(1<x\le 4\).

Step 3

Exam Tip

हर वाले वर्गमूल के लिए (x-1>0) और दूसरे वर्गमूल के लिए \(4-x\ge 0\) चाहिए। इसलिए \(1<x\le 4\)।

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यदि (f(x)=\sqrt{x-1}+\sqrt{9-x}), तो (f) का परिसर क्या है?

If (f(x)=\sqrt{x-1}+\sqrt{9-x}), what is the range of (f)?

Explanation opens after your attempt
Correct Answer

A. \( [2\sqrt{2},4] \)

Step 1

Concept

At the endpoints the value is \(2\sqrt{2}\), and at the midpoint (x=5), the maximum is (4). For symmetric radicals, check both endpoints and the midpoint.

Step 2

Why this answer is correct

The correct answer is A. \( [2\sqrt{2},4] \). At the endpoints the value is \(2\sqrt{2}\), and at the midpoint (x=5), the maximum is (4). For symmetric radicals, check both endpoints and the midpoint.

Step 3

Exam Tip

सिरों पर मान \(2\sqrt{2}\) और मध्य (x=5) पर अधिकतम (4) है। सममित वर्गमूलों में सिरों और मध्य दोनों जांचें।

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