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Dengan demikian:
x₁ = -1 - 4 = -5
x₂ = -1 + 4 = 3
Dengan memfaktorkan:
0 = -x² - 2x + 15
0 = -(x² + 2x - 15)
0 = x² + 2x - 15
0 = (x+5)(x-3)
Dengan demikian:
x₁ = -5
x₂ = 3