question_answer

If \[f:R\to R\text{ }\] and \[g:R\to R\text{ }\] are defined by \[f(x)=2x+3\]and \[g\,(x)={{x}^{2}}+7\], then the values of x such that g{f{x)) = 8 are

A)  1, 2                 

B)  -1, 2         

C)  1, - 2               

D)  1, - 2