tuscany44 tuscany44

23-06-2014
Mathematics

contestada

Multiply and simplify
(x-3y) (x + 3y)

Respuesta :

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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