r^2=-2r

Solution for r^2=-2r equation:

Simplifying
r2 = -2r

Solving
r2 = -2r

Solving for variable 'r'.

Reorder the terms:
2r + r2 = -2r + 2r

Combine like terms: -2r + 2r = 0
2r + r2 = 0

Factor out the Greatest Common Factor (GCF), 'r'.
r(2 + r) = 0

Subproblem 1
Set the factor 'r' equal to zero and attempt to solve:

Simplifying
r = 0

Solving
r = 0

Move all terms containing r to the left, all other terms to the right.

Simplifying
r = 0
Subproblem 2
Set the factor '(2 + r)' equal to zero and attempt to solve:

Simplifying
2 + r = 0

Solving
2 + r = 0

Move all terms containing r to the left, all other terms to the right.

Add '-2' to each side of the equation.
2 + -2 + r = 0 + -2

Combine like terms: 2 + -2 = 0
0 + r = 0 + -2
r = 0 + -2

Combine like terms: 0 + -2 = -2
r = -2

Simplifying
r = -2
Solution
r = {0, -2}