CelinaCorte CelinaCorte

31-07-2016
Mathematics

contestada

Multiply
(2x - 5y)^2

Respuesta :

dalendrk dalendrk

01-08-2016

[tex](2x-5y)^2=(2x-5y)(2x-5y)\\\\=(2x)(2x)+(2x)(-5y)-(5y)(2x)-(5y)(-5y)\\\\=4x^2-10xy-10xy+25y^2=4x^2-20xy+25x^2\\\\or\ use:(a-b)^2=a^2-2ab+b^2\\\\(2x-5y)^2=(2x)^2-(2x)(5y)+(5y)^2=4x^2-10xy+25y^2[/tex]

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