Question

FUNGSI KOMPOSISI

diketahui fungsi f(x)=2x + 1 dan f(g(x+1))= -2x^2 -4x -1.
berapa nilai g(-2)???

Answer 1

f(g(x+1)) = -2x² -4x -1
2(g(x+1))+1 = -2x² -4x -1
g(x+1) = (-2x² -4x -1-1) / 2
g(x+1) = -x²-2x-1

g(-2) jika nilai x = -3
g(-2) = -(-3)²-2(-3)-1 = -9+6-1 = -4