College Algebra / Alg 222 · Atom · ~20 seconds
Equations Quadratic in Form
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State
An equation is quadratic in form when a substitution for a repeated expression turns it into a quadratic.
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x⁴ − 5x² + 4 = 0 under u = x² becomes u² − 5u + 4 = 0: u is 1 or 4, so x is ±1 and ±2.
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Translate back to x; u is scaffolding.
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