Division via Conjugate (z₁/z₂ = (z₁ z̄₂)/|z₂|²)

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z₁/z₂ = (z₁ z̄₂)/|z₂|²

What each symbol means

SymbolWhat it stands for
z̄_2Conjugate of denominator — multiply top and bottom by z̄₂
z_1, z_2Complex numbers with z₂ ≠ 0

When to use this

z₂ ≠ 0. Denominator becomes real |z₂|²; numerator expanded as usual.