tuscany44
tuscany44 tuscany44
  • 23-06-2014
  • Mathematics
contestada

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

Relax

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konrad509
konrad509 konrad509
  • 23-06-2014
[tex](x-3y) (x + 3y)=x^2-9y^2\\\\ (a-b)(a+b)=a^2-b^2[/tex]
Answer Link
Аноним Аноним
  • 23-06-2014
[tex](x-3y)(x+3y) \\ =x^2+3xy-3xy-9y^2 \\ =x^2-9y^2[/tex]
Answer Link

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