diketahui (gof)(x)=2x^+4x+1 dan f(x)=x+2 ,tentukan: a).g(x) b).g(-2)

(gof)(x) = 2x²+4x+1
g(f(x)) = 2x²+4x+1
g(x+2) = 2x²+4x+1
g(x) = 2(x-2)²+4(x-2)+1
g(x) = 2(x²-4x+4)+4x-8+1
g(x) = 2x²-8x+8+4x-7
g(x) = 2x²-4x+1

g(-2) = 2(-2)²-4(-2)+1 = 17