For example, two standard form quadratic equations are f(x) = x 2 + 2x + 1 and f(x) = 9x 2 + 10x -8.X Research source In this form, the quadratic equation is written as: f(x) = ax 2 + bx + c where a, b, and c are real numbers and a is not equal to zero. If you're doing a homework problem, you'll usually receive the problem in one of these two forms - in other words, you won't be able to choose, so it's best to understand both. You can use either form to graph a quadratic equation the process for graphing each is slightly different. The quadratic equation can be written in three different forms: the standard form, vertex form, and the quadratic form.
Determine which form of quadratic equation you have.
