diketahui f(x)=2x+1 dan g(x)=4-2x nilai dari (f-g) invers (5)

jawab

(f-g) invers 5

{f(x) - g(x)} (x) = 2x +1 -4 + 2x 
(f(x) - g(x)) (x) = 4x - 3

y = 4x -3
4x = y + 3
x = 1/4 y  + 3/4

(f-g)⁻¹(x)  = 1/4 x + 3/4
(f-g)⁻¹ (5) = 5/4 + 3/4 = 2