If $g(x) = x^{2} + x - 2$ and $\frac{1}{2}\,g\circ f(x) = 2x^{2} - 5x + 2$, then $f(x)$ is equal to (1) $2x-3$ (2) $2x+3$ (3) $2x^{2}+3x+1$ (4) $2x^{2}-3x-1$
If $g(x) = x^{2} + x - 2$ and $\frac{1}{2}\,g\circ f(x) = 2x^{2} - 5x + 2$, then $f(x)$ is equal to\\
(1) $2x-3$\\
(2) $2x+3$\\
(3) $2x^{2}+3x+1$\\
(4) $2x^{2}-3x-1$