jika g(x) = x²+2x+3 dan (f°g) (x) = 3x²+6x+5 tentukan f(x-1)

jawab

fog(x) = 3x^2 + 6x + 5
f (g(x))  = 3x^2 + 6x + 5
f (x^2 + 2x + 3) = 3x^2 + 6x + 5
f(x^2 + 2x + 3) = 3(x^2 + 2x + 3)  - 4
f(x)=3x  - 4
f(x-1) = 3(x -1) - 4
f(x -1) = 3x - 3 - 4
f(x -1) = 3x - 7