Question

Спростити вираз. (х+у)^2+(х-у)^2-2х^2

Answer 1

x²+у²+2xy+x²+y²+2xy-2x²=2x²+2y²+4xy-2x²=2(x²+y²+2xy)-2x²= 2(x+y)²-2x²=2((x+y)-x²)