Factored form is another formula used to solve a quadratic relation. The factored formula y= a (x-r) (x-s) is the easiest way to get the x-intercept(s) of the graph because the r and the s are the x intercepts.
Here are some examples of factored form: y=(x-4)(x+4) y=21(x+9)(x+10) y=(x-32)(x-18)