jika (fog)((x)= 10x-8 dan g(x)= 2x+4 maka f^-1(x)=

jawab

(fog)(x)= 10x - 8 ,  g(x)= 2x + 4
f{ g(x)} = 10x - 8
f{2x +4} = 10 x - 8
f⁻¹(10x -8) = 2x + 4
10x - 8 = y
10x = y+ 8
x = 1/10 (y+8)

f⁻¹(y) = 2 (1/10)(y+8)  +  4
f⁻¹(y) = 1/5 (y+8) + 4
f⁻¹(x) = 1/5(x+8) + 4