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10 cards from this deck
Inequality involving a quadratic expression
Equations: specific x-values; Inequalities: ranges/intervals
x-values where the expression equals zero (the roots)
Systematically find where expression is positive or negative
Opens upward (U-shape)
Opens downward (∩-shape)
≥0\geq 0≥0 always; =0= 0=0 only when expression =0= 0=0
When multiplying or dividing by a negative number
Values making denominators zero cannot be in solution
Included: ≤\leq≤, ≥\geq≥; Excluded: <<<, >>>
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