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parabola/pəˈræbələ/The curve formed by points equally distant from a fixed point and a fixed straight line.
quadratic/kwɒˈdrætɪk/An algebraic expression whose highest power of the variable is two.
completing the square/kəmˈpliːtɪŋ ðə skweə/Rewriting a quadratic expression as a squared linear expression plus or minus a constant.
vertex/ˈvɜːteks/A corner or meeting point of edges, a turning point of a parabola, or a node in a graph, depending on the context.
discriminant/dɪˈskrɪmɪnənt/The value b squared minus 4ac, which determines the nature of a quadratic equation's roots.
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