Jika f(x) = x²+3x-2 dan g(x) = 2x+5. Jika (f • g)(-2) = ... ?

f(x) = x^2 + 3x - 2
g(x) = 2x + 5

(f o g)(x)
= f (g(x))
= (g(x))^2 + 3(g(x)) - 2
= (2x + 5)^2 + 3(2x + 5) - 2
= 4x^2 + 20x + 25 + 6x + 15 - 2
= 4x^2 + 26x + 38

(f o g)(-2)
= 4(-2)^2 + 26(-2) + 38
= 4(4) + (-52) + 38
= 16 - 52 + 38
= 2