dik g(x)=3x+7 (gof)(x)=3x²-9x-8 dit f(x)=.....

g(f(x))=3x^2-9x-8
3f(x)+7=3x^2-9x-8
3f(x)=3x^2-9x-15
f(x)=(3x^2-9x-15):3
f(x)=x^2-3x-5

Rate 5 bintang ya. Thanks.