Quadratic equations function in the same manner as linear equations in that you have a particular input resulting in a particular output. You plot points on the graph in the same manner as you do linear equations. The difference is that the graph of a quadratic forms a curved line, called a parabola, instead of a straight line. You will not need to know the quadratic formula for the ISEE.

Aside from knowing what a quadratic equation will look like on a graph, you will need to know how to find its *x*‐intercepts and its vertex (the highest or lowest point of a parabola). To find a quadratic equation’s *x*‐ intercepts, the quadratic equation must be set equal to zero (0). The reason for this is that for any coordinate that falls on the *x*‐axis, the value of y will be zero (ex. (3, 0) or (‐3, 0)). This is also true for solving for *x* for quadratic equations, since it is the same thing. If your quadratic equation is set to anything other than zero, you must manipulate the quadratic equation to equal zero.

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