Example: Factor 4x 2 − 9. Hmmm... there don't seem to be any common factors. But knowing the Special Binomial Products gives us a clue called the "difference of squares":. Because 4x 2 is (2x) 2, and 9 is (3) 2,. So we have: 4x 2 − 9 = (2x) 2 − (3) 2. And that can be produced by the difference of squares formula:

Current calculator limitations. Doesn't support multivariable expressions If you have an expression that you want the calculator to support in the future, please contact us; Factoring Expressions Video Lesson