Question

Упростите выражение x²+4-(x-2)²

Answer 1

x^2+4-(x-2)^2=
x^2+4-x^2+4x-4 =
4x

Answer 2

$x^2+4-(x-2)^2=x^2+4-(x^2-4x+4)=x^2+4-x^2+4x-4=4x$