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Find gof if f(x)= 8x-2 and g(x) = 2x...

Find gof if `f(x)= 8x-2` and `g(x) = 2x`

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The correct Answer is:
D
`(gof)(2)=g(f(2))=g(4xx2+5)=g(13)`
`=(13)^(2)+4=173`
and `(fog)(g)=f(g(9))=f(9^(2)+4)=f(85)`
`=8xx85+3=683`
`therefore 4(gof)(2)-(fog)(9)=4xx173-683=9`
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