a2 – b2
Take note that the first term and the last term are both perfect squares.
When we factor a difference of two squares, we will get
a2 – b2 = (a + b)(a – b)
This is because (a + b)(a – b) = a2– ab + ab – b2 = a2– b2
Read the lesson on Difference of Squares if you need more information.
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