If and , then is equal…

MATHEMATICS · Single correct · CBSE · Mathematics · Relations and Functions · Relations and Functions

Problem

If g(x)=x2+x−2g(x)=x^2+x-2 and 12(g∘f)(x)=2x2−5x+2\dfrac{1}{2}(g\circ f)(x)=2x^2-5x+2, then f(x)f(x) is equal to (a) 2x−32x-3 (b) 2x+32x+3 (c) 2x2+3x+12x^2+3x+1 (d) 2x2−3x−12x^2-3x-1

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