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f (x+1) = 2 (x+1)² - 6 (x+1)
= 2 ( x² + 2x + 1) - 6x - 6
= 2x² + 4x + 2 - 6x - 6
= 2x² - 2x -4
f(x)=2x² - 6x,
Ditanyakan : f(x+1)
Penyelesaian :
f(x)=2x² - 6x (ganti x dengan(x+1)), sehingga menjadi :
⇒ f(x+1) = 2(x+1)² - 6(x+1)
⇒ f(x+1) = 2(x² + 2x + 1) - 6x - 6
⇒ f(x+1) = 2x² + 4x + 2 - 6x - 6
⇒ f(x+1) = 2x² + 4x - 6x + 2 - 6 (kumpulkan yg sejenis)
⇒ f(x+1) = 2x² - 2x - 4