Diketahui f(x)= 3x - 1 dan g(x) = 2x + a jika (fog)(-2) = 2 maka nilai a^2 + 2a + 1 =

f(x) = 3x - 1
g(x) = 2x + a

(fog)(-2) = 2
= 3(2(-2)+a)-1 = 2
= -12 + 3a -1 = 2
= 3a = 15
= a = 5

nilai a^2 + 2a + 1 = 5^2 + 2(5) + 1 = 36

(fog)(-2) = 3(2(-2)+a) -1
2 = 3(-4+a) -1
2 = -12 + 3a -1
a = 15/3 = 5

5² + 2(5)+1
= 25 +10 +1
= 36