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Find fog if f(x)= x-2 and g(x) = 3x...

Find fog if `f(x)= x-2 ` and `g(x) = 3x`

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The correct Answer is:
A
`(fog)(7)=f(g(7))=f(7^(2)+4)=f(53)`
`=8(53)+3=427`
and `(gof)(6)=g(f(6))=g(4xx6+5)+g(29)`
`=(29)^(2)+4=845`
`therefore 2(fog)(7)-(gof)(6)=2xx427-845=9`
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