Question

valores x=-2 e y=4

x² +2xy+y²
x²+xy-3x-3y

Answer 1

seja x = -2 e y = 4

x² + 2xy + y²  = (x + y)² = (-2 + 4)² = 2² = 4

x² + xy - 3x - 3y = (x - 3)*(x + y) = -5*2 = -10