3(x+y) в квадрате-6xy=

Question

3(x+y) в квадрате-6xy=

Answer 1

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

Answer 2

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