dik.( g o f )= 18x^2 + 24x + 2 dan fungsi g (x) = 2x^2 - 6,maka rumus fungsi f(x) adalah..

gof=g(f(x))=18x^2+24x+2
2(f(x))^2-6=18x^2+24x+2
2(f(x))^2=18x^2+24x+8
(f(x))^2=9x^2+12x+4
f(x)=akar9x^2+12x+4
f(x)=3x+2