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atau
(x1 + x2)³ = x1³ + 3x1²x2 + 3x1 x2² + x2³
(x1 + x2)³ = x1³ + x2³ + 3x1 x2 (x1 + x2)
x1³ + x2³ = (x1 + x2)³ - 3x1 x2 (x1 + x2)
Sehingga.
x₁³+x₂³ = (x₁+x₂)³ - 3x₁²x₂ - 3x₁x₂²
x₁³+x₂³ = (x₁+x₂)³ - 3x₁x₂(x₁+x₂)