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