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If y = x^3 - ax^2 + 48x + 7 is an increa...

If `y = x^3 - ax^2 + 48x + 7` is an increasing function for all real values of `x,` then `a` lies in

A

`(-14,14)`

B

`(-12,12)`

C

`(-16,16)`

D

`(-21,21)`

Text Solution

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The correct Answer is:
B
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