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OpenStudy (anonymous):
Find the product: (5x-4y)^2
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OpenStudy (saifoo.khan):
(5x-4y)(5x-4y) FOIL
OpenStudy (anonymous):
or (a-b)^2=a^2-2ab+b^2
OpenStudy (anonymous):
so the answer is 25x^2+16y^2
OpenStudy (saifoo.khan):
25 x^2-40 x y+16 y^2
OpenStudy (anonymous):
(5x)(5x)= 25x^2 (5x)(-4y)= -20xy (-4y)(-4y)=16y^2 (-4y)(5x)=-20xy 25x^2-40xy+16y^2
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OpenStudy (anonymous):
25x^2-40xy+16y^2
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