Question

Спростити вираз (2x-y) квадрат - (x-y)(x+2y)

Answer 1

(2x-y)^2=4х^2-4xy+y^2

Answer 2

= 4х^2- 4ху +у^2- х^2 - 2ху + ху +2у^2 = 3х^2-5ху+3у^2