Question

упроститн вырадение (3x+y)(2x-5y) -6(x-y) ^2

Answer 1

6х+2ху-15ху-5у в кв.-3х+3у=3х-13ху-5у в кв.+ 3у

Answer 2

(3x+y)(2x-5y) -6(x-y) ^2 = 6x^2 - 15xy +2xy -5y^2 - 6(x^2 - 2xy + y^2) =

= 6x^2 - 13xy  -5y^2 - 6x^2 + 12xy - 6y^2 = -xy - 11 y^2