Упростите вырожение: 6ху-х²+3(х-у)²=..?

Question

Упростите вырожение: 6ху-х²+3(х-у)²=..?

Answer 1

6xy-x^2+3(x-y)^2=6xy-x^2+3(x^2-2xy+y^2)=6xy-x^2+3x^2-6xy+3y^2=2x^2+3y^2