Question

(-x2 + 2xy-y 2) - (x²+2x1 - 12)

Answer 1

Respuesta: $=-2x^2+2xy-2x-y^2+12$

Explicación paso a paso:

$\left(-x^2+2xy-y^2\right)-\left(x^2+2x^1-12\right)\\=-x^2+2xy-y^2-\left(x^2+2x^1-12\right)\\=-x^2+2xy-y^2-\left(x^2+2x-12\right)\\=-x^2+2xy-y^2-x^2-2x+12\\=-2x^2+2xy-2x-y^2+12$