College Algebra / Alg 218 · Atom · ~20 seconds
The Unchecked-Squaring Error
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The unchecked-squaring error reports every root of the squared equation as a solution of the original; the fabricated ones survive only because nobody checked.
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√(2x + 3) = x squares to roots 3 and −1. But √1 = 1, not −1 — the check executes the impostor, and only 3 stands.
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