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Stosujesz wzór na różnicę kwadratów:
y = 2(x² + 2x + 1) - 2
y = 2x² + 4x + 2 - 2
y = 2x² + 4x
2x² + 4x = 0
równanie kwadratowe niezupełne postaci ax² + bx = 0
pierwiastki
x₁ = 0
x₂ = - b/a = - 4/2 = - 2
postać iloczynowa
y = a(x - x₁)(x - x₂) = 2(x - 0)(x + 2) = 2x(x + 2)