(х-2у)² - (х+2у)(2у-х)=

Question

(х-2у)² - (х+2у)(2у-х)=

Answer 1

(x -2y)² =(2y -x)²

(2y -x)² -(x +2y)(2y -x) =(2y -x)(2y -x -(x+2y)) =(2y -x)(2y -x -x +2y) = -2x(2y -x) =2x(x -2y)