Скачать или смотреть How to Solve Quadratic Equation Graphically

Using graph to solve quadratic equations

In earlier chapters I've shown you how to solve quadratic equations by factoring, Completing the Square and by the use of General Formula.
A quadratic equation as you remember is an equation that can be written on the standard form:
ax²+bx+c=0, where a≠0

Another way of solving a quadratic equation is to solve it graphically. The roots of a quadratic equation are the x-intercepts of the graph, i.e the point(s) where the curve (parabola) touches the x-axes.
Graphing the equation could be done by making a table of values which you will see in this lesson.
A graph of x against y is plotted by joining the points of intersection between x and corresponding y values.

The point(s) where the curve touches the x axes determine the solution for such quadratic Equation.

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