यदि (f(x)=ax-2+4) का परिसर \([4,\infty\)) है, तो (a) के लिए कौन सी शर्त सही है?

If the range of (f(x)=ax-2+4) is \([4,\infty\)), which condition on (a) is correct?

Explanation opens after your attempt
Correct Answer

A. (a>0)

Step 1

Concept

An upward-opening parabola gives \([4,\infty\)) only when (a>0). If (a=0), the range is only ({4}).

Step 2

Why this answer is correct

The correct answer is A. (a>0). An upward-opening parabola gives \([4,\infty\)) only when (a>0). If (a=0), the range is only ({4}).

Step 3

Exam Tip

ऊपर खुलने वाला परवलय तभी \([4,\infty\)) देता है जब (a>0)। (a=0) पर परिसर केवल ({4}) होगा।

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Mathematics Answer, Explanation and Revision Hints

यदि (f(x)=ax-2+4) का परिसर \([4,\infty\)) है, तो (a) के लिए कौन सी शर्त सही है? / If the range of (f(x)=ax-2+4) is \([4,\infty\)), which condition on (a) is correct?

Correct Answer: A. (a>0). Explanation: ऊपर खुलने वाला परवलय तभी \([4,\infty\)) देता है जब (a>0)। (a=0) पर परिसर केवल ({4}) होगा। / An upward-opening parabola gives \([4,\infty\)) only when (a>0). If (a=0), the range is only ({4}).

Which concept should I revise for this Mathematics MCQ?

An upward-opening parabola gives \([4,\infty\)) only when (a>0). If (a=0), the range is only ({4}).

What exam hint can help solve this Mathematics question?

ऊपर खुलने वाला परवलय तभी \([4,\infty\)) देता है जब (a>0)। (a=0) पर परिसर केवल ({4}) होगा।