Jika f(x+1) = 2x² + 4x - 1 maka f(x) adalah... Mohon dijawab kak pliss!!!

Kelas 10 Matematika
Bab Fungsi Komposisi

f(x + 1) = 2x² + 4x - 1
f(x - 1 + 1) = 2(x - 1)² + 4 (x - 1) - 1
f(x) = 2(x² - 2x + 1) + 4x - 4 - 1
f(x) = 2x² - 4x + 2 + 4x - 5
f(x) = 2x² - 3

2(x-1)²+4(x-1)-1
=2(x²-2x+2)+4x-4-1
=2x²-4x+4+4x-5
=2x²-3