bntu aku ngrjkn soal a & b dgn caranya

f(x) =x^2+2x+4
g(x)=x+3
dit:(fog) (x)
(gof) (x)
jawab :
fog(x)= f(x+3)
=(x+3)^2 +2(x+3)+4
=(x^2+9x+9)+2x+6+4
=x^2+11x+19
gof(x)=g(x^2+2x+4)
=(x^2+2x+4)+3
=x^2+2x+7
=