Question

Выполните действие (х+у)^2-(х-у)^2

Answer 1

x^2+2xy+y^2-x^2+2xy-Y^2=4xy

Answer 2

(x + y)² - (x - y)² = (x + y + x - y)(x + y - x + y) = 2x * 2y = 4xy