Question

Спростіть вираз
1) (2а - х) (2а +х) + х² =
2) (m - n)² + (m + n)² - 2m² =

Answer 1

1)=4a^2+2ax-2ax-x^2=4a^2-x^2
2)=m^2-2mn+n^2+m^2+2mn+n^2-2m^2=n^2+n^2=2n^2