diketahui f(x)=x+5 dan g(x)=4-2x tentukan (fog)-1(x)

(fog)(x)=f(g(x))=f(4-2)
=(4-2x)+5
=4+5-2x
=9-2x
maka:(fog)(1)=9-2(1)=7


maaf kalo ada kesalahan

fog (x)
= f(gx)
= (4-2x) +5
= -2x +9
sehingga
fog(x) = -2x+9
y= -2x +9
2x=-y+9

[tex]x = \frac{ - y + 9}{2} \\ {fog(x)}^{ - 1} = \frac{ - x + 9}{2} [/tex]