How do you factor x2 - y2?

x2 − y2 = ( x − y ) ( x + y )

When multipled ( x − y ) by ( x + y ) then the terms in xy cancel out, leaving x2 − y2

( x − y ) ( x + y ) = x 2 + x y − y x − y 2

= x2 + xy − xy − y2 =

x2 − y2

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