diketahui fungsi g(x)=x+5 dan f(x)=x^2-3x-12. komposisi fungsi (fog)(x)=.....

f(x) = x^2 - 3x - 12
g(x) = x + 5

(fog)(x) = (x+5)^2 - 3(x+5) - 12
            = x^2 +10x + 25 - 3x -15 - 12
            = x^2 +7x -2

(fog)(x)=(x+5)^2-3(x+5)-12
=x^2+10x+25-3x-15-12
=x^2+7x-2