Lemma
EasyQuadratics
OpenStax, Elementary Algebra 2e §7.6 Quadratic Equations · Try It 7 · Algebra · Quadratics

Quadratic Equations · Try It 7

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OpenStax, Elementary Algebra 2e · §7.6 Quadratic Equations · Try It 7

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Checked against the answer in OpenStax, Elementary Algebra 2e.