College Algebra / Alg 331 · Atom · ~20 seconds
Maximum and Minimum Values
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A quadratic function's extreme value is its vertex output k: a minimum when the parabola opens up, a maximum when it opens down.
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x² − 4x + 3 bottoms out at −1; g(x) = −2x² + 8x peaks at g(2) = 8 — the sign of a picks which story.
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