Question

Diketahui f(x) = x-2 g(x)=x2 + 4 + -3 dan gof(x)=2 .tentukan nilai x?

Answer 1

F(x) = x - 2
g(x) = x² + 4x + (-3)

gof(x) = g(f(x))

2 = (x - 2)² + 4 - 3

0 = x² - 4x + 4 + 4 - 3 - 2

0 = x² - 4x + 3

0 = (x - 3)(x - 1)

sehingga x = 3 dan/atau x = 1