Lemma
EasyArithmetic of ℂ
OpenStax, Intermediate Algebra 2e §8.8 Use the Complex Number System · Try It 20 · Complex Numbers · Arithmetic of ℂ

Use the Complex Number System · Try It 20

Multiply using the Product of Complex Conjugates Pattern:

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OpenStax, Intermediate Algebra 2e · §8.8 Use the Complex Number System · Try It 20

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