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If g(x)=x^3+x-2 and g(f(x))=x^3+3x^2+4x ...

If `g(x)=x^3+x-2` and `g(f(x))=x^3+3x^2+4x` then f(1)+f(2) is equal to ________

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The correct Answer is:
5
Obviously g is one - one
`g(f(1))=8 and g(2)=8`
`"So "f(1)=2`
`g(f(2))=28 and g(3)=28`
`"So "f(2)=3`
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