f (x + 1) = ….
A. x² + 8x + 13
B. x² – 8x + 13
C. x² + 8x + 17
D. x² + 8x – 17
(Pakai cara!)
F (x – 2) = x² + 2x – 2
f(x – 2) = x² + 2x – 2
f(x + 1)
= f(x – 2 + 3)
= f[(x – 2) + 3]
= (x + 3)² + 2(x + 3) – 2
= (x² + 6x + 9) + (2x + 6) – 2
= x² + 6x + 9 + 2x + 6 – 2
= x² + 8x + 13