fungsi f:r-> r &g:r -> r di tentukan oleh f(x)=2x +5 dan g(x)=x+2,maka (fog)-¹ (x)

f(x) = 2x + 5
g(x) = x + 2

f(g(x)) = 2(x + 2) + 5 = 2x + 9
y = 2x + 9
2x = y - 9
x = (y - 9)/2

(fog)^-1 (x) = (x - 9)/2 ✔