quadratic function, A function that can be written in the form f(x) = ax2 + bx + c, where a is non-zero., parabola, The U-shaped curve that represents the graph of a quadratic function., vertex, The highest or lowest point on a parabola, represented by the coordinates (h, k)., axis of symmetry, A vertical line that divides the parabola into two mirror-image halves., open upward, The direction of a parabola when the leading coefficient 'a' is positive, open downward, The direction of a parabola when the leading coefficient 'a' is negative.

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