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If f(x)=x^3+7x^2+8x-9 , find f\ '\ (4) ....

If `f(x)=x^3+7x^2+8x-9` , find `f\ '\ (4)` .

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Given function,
`f(x)=x^3+7x^2+8x-9`
`=>f'(x)=3x^2+14x+8`
`=>f'(4)=3(4)^2+14(4)+8`
`=48+56+8`
`=112`
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