Still the difference of squares method is often taught, and so I will show it here.

Basically the difference of squares is always factored in the following form:

(x+y)(x-y)

Which equals (x

^{2}- y

^{2})

Example

x

^{2}- 9

9 is a perfect square so we can use the memorized formula

(x-3)(x+3)

Again, I prefer gaining an intuitive understanding of factoring, but memorizing a rule like this can help till you gain an intuitive understanding.

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