Solve Quadratic Equations — Quadratic Formula

x = (−b ± √(b²−4ac)) / 2a gives both solutions of ax²+bx+c = 0. The discriminant b²−4ac tells how many real roots exist.

Algebra 1Common Core HSA-REI.B.4bA-REIVerified correct ✓

Worked examples

Solve for x: 2x² + 4x = 0
Answer: {-2, 0}

Solve for x: 3x² - 24x + 36 = 0
Answer: {2, 6}

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