Question

Diket (g(x))=x+1 dan (fog)(x)=x2+3x+1 tentukan f(x)

Answer 1

G(x) = x + 1
(f o g)(x) = x² + 3x + 1
f(x + 1) = (x + 1)² + (x + 1) - 1
f(x) = x² + x - 1

Answer 2

F (x+1) = x²+3x+1 = (x²+2x+1) +(x+1) - 1
           = (x+1)² + (x+1) - 1
f(x) = x²+x-1