All quadratic functions have the same type of curved graphs with a line of symmetry. The graph of the quadratic function \ (y = ax^2 + bx + c\) is a smooth curve with one turning point.

Show answer Solving equations with quadratic graphs 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.

Ivan Baggs, Functions with a Closed Graph, Proceedings of the American Mathematical Society, Vol. 43, No. 2 (Apr., 1974), pp. 439-442 ...