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Subjects>Math>Algebra

Factorise x2 minus y2 plus 9x minus 9y?

Updated: 4/28/2022

Snowball8123 ∙

Lvl 1

∙ 14y ago

Best Answer

x2 - y2 + 9x - 9y =

(x2 + 9x) - (y2 + 9y) =

x(x + 9) - y(y + 9)

================================

Another way to go after it:

x2 - y2 + 9x - 9y =

(x2 - y2) + 9x - 9y =

(x + y) (x - y) + 9 (x - y) =

(x + y + 9) (x - y)

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