यदि \(f:R\to R\), (f(x)=x-2+4x+7), तो (f) का परास क्या है?

If \(f:R\to R\), (f(x)=x-2+4x+7), what is the range of (f)?

Explanation opens after your attempt
Correct Answer

A. \([3,\infty\))

Step 1

Concept

Write (x-2+4x+7=(x+2)2+3).

Step 2

Why this answer is correct

Since ((x+2)2\ge0), (f(x)\ge3).

Step 3

Exam Tip

The minimum value is (3), so the range is \([3,\infty\)). चरण 1: (x-2+4x+7=(x+2)2+3) लिखें। चरण 2: ((x+2)2\ge0), इसलिए (f(x)\ge3)। चरण 3: न्यूनतम मान (3) है, अतः परास \([3,\infty\)) है।

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Mathematics Answer, Explanation and Revision Hints

यदि \(f:R\to R\), (f(x)=x-2+4x+7), तो (f) का परास क्या है? / If \(f:R\to R\), (f(x)=x-2+4x+7), what is the range of (f)?

Correct Answer: A. \([3,\infty\)). Explanation: चरण 1: (x-2+4x+7=(x+2)2+3) लिखें। चरण 2: ((x+2)2\ge0), इसलिए (f(x)\ge3)। चरण 3: न्यूनतम मान (3) है, अतः परास \([3,\infty\)) है। / Step 1: Write (x-2+4x+7=(x+2)2+3). Step 2: Since ((x+2)2\ge0), (f(x)\ge3). Step 3: The minimum value is (3), so the range is \([3,\infty\)).

Which concept should I revise for this Mathematics MCQ?

Write (x-2+4x+7=(x+2)2+3).

What exam hint can help solve this Mathematics question?

The minimum value is (3), so the range is \([3,\infty\)). चरण 1: (x-2+4x+7=(x+2)2+3) लिखें। चरण 2: ((x+2)2\ge0), इसलिए (f(x)\ge3)। चरण 3: न्यूनतम मान (3) है, अतः परास \([3,\infty\)) है।