Question

Please bantu .....
jika g(x) = X - 2 dan fog(x) = X2 - X - 7 maka nilai f(x) =

Answer 1

Permisalan:
x-2=a
x=a+2

(fog)(x)=x²-x-7
f((g(x))=x²-x-7
f(x-2)=x²-x-7

masukan permisalan:
f(x-2)=x²-x-7
f(a)=(a+2)²-(a+2)-7
f(a)=a²+4a+4-a+2-7
f(x)=x²+3x-1