Pre Calc – Week 7

One thing that I learned this week in Pre Calc 11 is how to solve a chart with the properties of quadratic functions. To chart a quadratic equation you have to know how to tell when the table of value is showing a quadratic equation, instead of a linear equation. A linear equation in a table of value always has a y value (the output) that goes up or down by the same amount each time in the first differences. A quadratic equation in a table of value always has a y value that goes up or down by the same amount each time in the second difference. Below is a example of both a linear equation, and a quadratic equation charted.

When solving for quadratic functions, you should remember that the x intercept is always equal to y=0 and the y intercept is equal to x=0. Keeping this in mind when solving, to find y you simply plug x into the given quadratic function. Below are some examples to visualize how I would solve for y using the table of values and quadratic function.

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