Question

desenvolva (x + y - 6)²

Answer 1

x^2 + x^2 - xy + 36

(x+y-6)^2

(x+y-6).(x+y-6)

x^2 + xy - 6x + yx + y^2 - 6y - 6x - 6y + 36

x^2 + 2x.2y - 12x + y^2 - 12y + 36

x^2 + y^2 - 12x + 2x + 2y - 12y + 36

x^2 + y^2 - 10x - 10y + 36

x^2 + y^2 - xy + 36