Question

TENTUKAN RUMUS f(x),JIKA DI KETAHUI
a.g(x) = x² + 1 dan (gof) (x) = 2x + 1
b.g(x) =x - 2 dan (gof) (x) = x² + 6x

trims

Answer 1

A) g(f(x)) = 2x + 1
 f²(x) + 1 = 2x + 1
f²(x) = 2x
f(x) = √(2x)

b) g(f(x)) = x² + 6x
f²(x) - 2 = x² + 6x
f²(x) = x² + 6x + 2
f(x) = √(x² + 6x + 2)