(x+y)^2-10(x+y)^2+25

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(x+y)^2-10(x+y)^2+25(x+y)^2-10(x+y)^2+25(x+y)^2-10(x+y)^2+25(x+y)^2-10(x+y)^2+25=25-9(x+y)^2=(5-3x-3

(x+y)^2-10(x+y)^2+25
(x+y)^2-10(x+y)^2+25

(x+y)^2-10(x+y)^2+25
(x+y)^2-10(x+y)^2+25
=25-9(x+y)^2
=(5-3x-3y)(5+3x+3y)

=(x+y-5)²

(x+y)^2-10(x+y)^2+25
=x ^2+y^2+2xy-10x^2-10y^2-20xy+25
=-9x^2-9y^2-18xy+25
=-(3x+3y)^2+25
=(5-3x-3y)(5+3x+3y)