4(x+y)(x-y)+(x+y)^2 плиз

Question

4(x+y)(x-y)+(x+y)^2 плиз

Answer 1

4(х+у)(х-у)+(х+у)^2=4х^2-4у^2+х^2+2ху+у^2=5х^2-3у^2+2ху.
Ответ:5х^2-3у^2+2ху.

Answer 2

4(x+y)(x-y)+(x+y)^2=(4x+4y)(x-y)+(x+y)^2=4x^2-4xy+4xy-4y^2+x^2+2xy+y^2=5x^2-3y^2+2xy