# 4.5 Quadrataic Inequalities - ≥ 0 or f(x ≤ 0 include...

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4.5 Inequalities Involving Quadratic Functions To solve a quadratic inequality using the graph, graph the inequality and find its x-intercepts. For f(x) > 0 (strict), find those values of x for which the curve is above the x-axis; and for f(x) < 0 (strict), find those values of x for which the curve is below the x-axis. If the inequality is not strict, e.g., f(x)
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Unformatted text preview: ≥ 0 or f(x) ≤ 0, include the x-intercepts in the solution. Given f(x) = x 2 + 2x – 15 and g(x) =x – 9, solve f(x) = g(x) and graph each equation: 1. Find f(x) > 0 2. f(x) ≤ 0 3. f(x) ≥ g(x) Given f(x) = - x 2 – x + 1 and g(x) = -x 2 + x + 6, solve f(x) = g(x) and graph each equation: 4. Find f(x) > -5 5. g(x) ≤ -6 6. f(x) ≥ g(x)...
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