komposisi fmgsi (fog)(x) adalah….
A. r? + 3x + 3
B. r2 + 3x +2
c.r? – 3x +3
D. x2 + 3x – 1
Е. x² + 3x+1
Diketahui fungsi g(x)= x + 1dan f(x) = x2+x-1
Jawaban:
f(x) = x² + x – 1
g(x)= x + 1
(fog)(x) = f(g(x))
= f(x + 1)
= (x + 1)² + (x + 1) – 1
= x² + 2x + 1 + x + 1 – 1
= x² + 3x + 1