A) \[(4,\,\,\infty )\]
B) \[[4,\,\,\infty )\]
C) \[\{4\}\]
D) \[\phi \]
Correct Answer: D
Solution :
\[f(x)={{x}^{2}}-4x+a\] always attains its minimum value. So its range must be closed. So,\[a=\left\{ \phi \right\}\]You need to login to perform this action.
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