The derivative `f(f(x))'=f'(x)*f'(f(x))`

`F'(8)=f'(8)*f'(f(8))=6*f'(4) ` because `f'(8)=6` and `f(8)=4`

`F'(8)=6*3=18`

`G'(x)=2F'(x)F(x)`

`G'(8)=2F'(8)F(8) `

`F'(8)=18`

`F(8)=f(f(8))=f(4)=3`

`G'(8)=2*18*3=108`

**Solution:** `F'(8)=18` **and** `G'(8)=108`

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