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VIDEO LESSONS:
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Quadratics: Tip: Every quadratic equation ax squared + bx + c = 0 graphs as a parabola-a U shaped curve. When the value of "a" is positive, the parabola opens up; when a is negative, the parabola opens down. The vertex (x, y) of the parabola can be determined by using the equations x = -b/2a, and then plugging the x value into the equation to solve for y.
When plotting a graph of a quadratic equation, first calculate and plot the vertex. Then set up a "table of values" that includes x values greater than and less than the x-coordinate of the vertex. Plug each x value into the equation to solve for the corresponding y.