Question

(xy+3)(xy-4)
(x+1)(x+3)+x(x-4)
(2x+1)(x-2)(+x(x+3)
(x+2)(x-4)-x(x-2)


Gracias

Answer 1

(xy+3)(xy-4)= xy^2-xy-12
(x+1)(x+3)+x(x-4)= 2x^2+3
(2x+1)(x-2)+x(x+3)= 3x^2-2
(x+2)(x-4)-x(x-2)= -8