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.