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If g(x) = x^2+x-2and 1/2g(f(x)) = 2x^2 -...

If g(x) = `x^2+x-2`and `1/2g(f(x)) = 2x^2 -5x+2`, then f(x) is

A

`2x-3`

B

`2x+3`

C

`2x^2+3x+1`

D

`2x^2-3x-1`

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The correct Answer is:
A
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  19. If f(x)=x^2 and g(x)=x^2+1 then: (f@g)(x)=(g@f)(x)=

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