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Let f be a polynomial function such that...

Let `f` be a polynomial function such that `f(3x)=f'(x);f''(x),` for all `x in R.` Then :

A

f(b)+f'(b)=28

B

f"(b)-f'(b)=0

C

f"(b)-f'(b)=4

D

f(b)-f'(b)+f"(b)=10

Text Solution

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The correct Answer is:
B
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