3(х-у)^2+6ху-х^2. Упростите !!((

Question

3(х-у)^2+6ху-х^2. Упростите !!((

Answer 1

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