Question

Jika f(x) = 2x-3 g(x) = x^2+2x+3 (fog)(a) = 33 . maka tentukan a nya?

Answer 1

(fog)(a)=33
(fog)(x)=2x^2 +4x+3
2a^2 + 4a + 3 = 33
2a^2 + 4a - 30 = 0
a^2+2a-15=0
(a + 5)(a - 3)=0
a=-5
a=3