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Quadratic RootsHigh School · Algebra · HSA-REI.B.4, HSA-SSE.B.3a, HSA-APR.B.3
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High School · Algebra · Think & learn · Ages 14–18
Quadratic Roots
Maths standardHSA-REI.B.4HSA-SSE.B.3aHSA-APR.B.3Solve quadratics by factoring and reading zeros from graphs; use the discriminant to count real solutions.
Solutions of ax² + bx + c = 0 are where the graph crosses the x-axis.
Factor, then set each factor to zero.
b² − 4ac > 0: two · = 0: one · < 0: none.
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