How do you solve x2+2x=0?

1 Answer
Jun 17, 2016

Simply removing the absolute value.

Explanation:

The absolute value can be solved considering two equations, one with the plus and one with the minus.

x2+2x=0

+(x2+2x)=0

(x2+2x)=0

In this case both equations are identical because you can multiply for 1 left and right the equations transforming one in the other.

Then the solution is

x2+2x=0

x(x+2)=0 that has two solutions, one that is x=0 and the other x=2.