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Let F:R- R be a thrice differentiable fu...

Let `F:R- R` be a thrice differentiable function. Suppose that `F(1)=0,F(3)=-4` and `F(x)<0` for all `x in (1/2,3)`. Let `f(x)=xF(x)` for all `x in R` The correct statement is

A

`9f'(3)+f'(1)-32=0`

B

`int_(1)^(3)f(x)dx=12`

C

`9f'(3)-f'(1)+32=0`

D

`int_(1)^(3)f(x)dx=-12`

Text Solution

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The correct Answer is:
C, D
`int_(1)^(3)x^(3)F''(x)dx=40`
`implies [x^(3)F'(x)]_(1)^(3)-int_(1)^(3)3x^(2)F'(x)dx=40`
`implies [x^(2)f'(x)-xf(x)]_(1)^(3)-3(-12)=40` (Using 1 and 2)
`implies9f'(3)-3f(3)-f'(1)+f(1)=4`
`implies9f'(3)+36-f'(1)+0=4 ( :' F(1),:.f(1=0))`
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