math
posted by kenny .
please show me how to solve this
(2x  5y) power of 2
i am having a problem with the way to step by step please solve this

(2x  5y)^2
(2x  5y)(2x 5y)
(2x)(2x) + (2x)(5y) + (5y)(2x) + (5y)(5y)
4x^2 + (10xy) + (10xy) + 25y^2
4x^2  20xy + 25y^2