tuscany44
tuscany44
23-06-2014
Mathematics
contestada
Multiply and simplify
(x-3y) (x + 3y)
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konrad509
konrad509
23-06-2014
[tex](x-3y) (x + 3y)=x^2-9y^2\\\\ (a-b)(a+b)=a^2-b^2[/tex]
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Аноним
Аноним
23-06-2014
[tex](x-3y)(x+3y) \\ =x^2+3xy-3xy-9y^2 \\ =x^2-9y^2[/tex]
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