Quadratic Equations (Jump to: Lecture | Video )

Below is a function in quadratic form:

Figure 1.

Quadratic Equation
In a Quadratic Equation, the value of the function is 0. For example:

The solutions of a quadratic equation are called roots. Roots for a quadratic equation can be found by locating the x-intercepts of the related quadratic function.

Figure 2.

Here, we've selected a series of points to plot the quadratic equation. Next, we fit the curve to find where it crosses the x-intercept.

Figure 3.

Our roots are at -4.83 and 0.83. We can check these in our original equation:

Figure 4.