Reginald1836viz
Reginald1836viz
Math
Answered
What is the sum of (x + 2y)² and (x − y)² ?
Sagot :
Riza1viz
Riza1viz
[tex](x + 2y)^2 + (x - y)^2 =\\\\=x^2+4xy+4y^2+x^2-2xy+y^2=\\\\=2x^2+2xy+5y^2[/tex]
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