Expert Mathematics Relations and Functions Class 12 Level 21

यदि \(f:[2,\infty\)\to[0,\infty)) तथा (f(x)=\sqrt{x-2}) हो तो (f^{-1}(x)) क्या होगा?

If \(f:[2,\infty\)\to[0,\infty)) and (f(x)=\sqrt{x-2}), what is (f^{-1}(x))?

Explanation opens after your attempt
Correct Answer

A. \(x^2+2\)

Step 1

Concept

Write \(y=\sqrt{x-2}\).

Step 2

Why this answer is correct

Squaring both sides gives \(y^2=x-2\), so \(x=y^2+2\).

Step 3

Exam Tip

When writing the inverse, the domain and range are interchanged. चरण 1: \(y=\sqrt{x-2}\) लिखें। चरण 2: दोनों ओर वर्ग करने पर \(y^2=x-2\) इसलिए \(x=y^2+2\)। चरण 3: व्युत्क्रम लिखते समय नए प्रांत और परास भी बदल जाते हैं।

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Mathematics Answer, Explanation and Revision Hints

यदि \(f:[2,\infty\)\to[0,\infty)) तथा (f(x)=\sqrt{x-2}) हो तो (f^{-1}(x)) क्या होगा? / If \(f:[2,\infty\)\to[0,\infty)) and (f(x)=\sqrt{x-2}), what is (f^{-1}(x))?

Correct Answer: A. \(x^2+2\). Explanation: चरण 1: \(y=\sqrt{x-2}\) लिखें। चरण 2: दोनों ओर वर्ग करने पर \(y^2=x-2\) इसलिए \(x=y^2+2\)। चरण 3: व्युत्क्रम लिखते समय नए प्रांत और परास भी बदल जाते हैं। / Step 1: Write \(y=\sqrt{x-2}\). Step 2: Squaring both sides gives \(y^2=x-2\), so \(x=y^2+2\). Step 3: When writing the inverse, the domain and range are interchanged.

Which concept should I revise for this Mathematics MCQ?

Write \(y=\sqrt{x-2}\).

What exam hint can help solve this Mathematics question?

When writing the inverse, the domain and range are interchanged. चरण 1: \(y=\sqrt{x-2}\) लिखें। चरण 2: दोनों ओर वर्ग करने पर \(y^2=x-2\) इसलिए \(x=y^2+2\)। चरण 3: व्युत्क्रम लिखते समय नए प्रांत और परास भी बदल जाते हैं।

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