f(x)= x+3 dan g(x)= 2x-1 nilai dari (f o g)^-1 (6) adalah... secepatnya yaa..

jawab

f(x) = x + 3
g(x) = 2x - 1

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

(fog)⁻¹(2x+2)= x
(fog)⁻¹(6)= ..
2x + 2 = 6
2x = 4
x = 2
(fog)⁻¹(6) = 2