tolong bantu jawab soal yang di lingkari ya

jawab

f(x) = 2x + 3
g(x) = 3x


a. gof(3) = g (f(3)) = g (2(3) + 3) = g(6+3) = g(9)
gof(3) = 3(9)  = 27

gof(-2) = g { f(-2)} = g (2(-2) + 3) = g (-4 + 3) = g(-1)
gof(-2) = 3(-1) = - 3

b. gof(x) = g { f(x)} = g(2x+ 3) = 3(2x+ 3) = 6x + 9
fog(x) = f { g(x)} = f{3x} = 2(3x)+ 3 = 6x + 3