Diketahui f(x)= x kuadrat dan g(x)= 1-2x. Jika (f o g)(a) = 25, nilai a=....

fog(a) = 25
f(g(a)) = 25
f(1-2x) = 25

(1-2x)² = 25
1-2x = √25
1-2x = ± 5

1-2x = 5
2x = 1-5
2x = -4
x = -2

1-2x = -5
-2x = -6
x = 3

Hp
{-2,3}