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≡ Penyelesaian:
⇔ Tentukan f(x):
⇒ f(x - 1) = x² + x - 1
⇒ f(x) = (x + 1)² + (x + 1) - 1
⇒ f(x) = x² + 2x + 1 + x + 1 - 1
⇒ f(x) = x² + 3x + 1
⇔ Tentukan f(x + 2):
⇒ f(x + 2) = (x + 2)² + 3(x + 2) + 1
⇒ f(x + 2) = x² + 4x + 4 + 3x + 6 + 1
⇒ f(x + 2) = x² + 7x + 11