Question

2(x-2y)square-50ysquare

Answer 1

Answer:

using formula (a-b)^2=a^2+b^2-2ab

Answer 2

Answer:

2(x-2y)^2-50^2

=2(x^2-2×x×2y+(2y)^2)-2500

2(x^2-4xy+4y^2)-2500

2x^2-8xy+8y^2-2500