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CelinaCorte
CelinaCorte CelinaCorte
  • 31-07-2016
  • Mathematics
Answered

Multiply

(2x - 5y)^2

Verified Answer :

dalendrk
dalendrk dalendrk
  • 01-08-2016

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

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