Graphs of quadratic functions can be used to solve equations. Example. Draw the graph of \(y = 2x^{2} + 2x – 4\) for values of –3 to 2.

Simultaneous equations where one of the graphs is quadratic and the other is a straight line can also be solved by reading the points of intersection. Example The graph of \(y = x^{2} – x – 2 ...