r^2+2r-0.5625=

Solution for r^2+2r-0.5625= equation:

Simplifying
r2 + 2r + -0.5625 = 0

Reorder the terms:
-0.5625 + 2r + r2 = 0

Solving
-0.5625 + 2r + r2 = 0

Solving for variable 'r'.

Begin completing the square.

Move the constant term to the right:

Add '0.5625' to each side of the equation.
-0.5625 + 2r + 0.5625 + r2 = 0 + 0.5625

Reorder the terms:
-0.5625 + 0.5625 + 2r + r2 = 0 + 0.5625

Combine like terms: -0.5625 + 0.5625 = 0.0000
0.0000 + 2r + r2 = 0 + 0.5625
2r + r2 = 0 + 0.5625

Combine like terms: 0 + 0.5625 = 0.5625
2r + r2 = 0.5625

The r term is 2r.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2r + 1 + r2 = 0.5625 + 1

Reorder the terms:
1 + 2r + r2 = 0.5625 + 1

Combine like terms: 0.5625 + 1 = 1.5625
1 + 2r + r2 = 1.5625

Factor a perfect square on the left side:
(r + 1)(r + 1) = 1.5625

Calculate the square root of the right side: 1.25

Break this problem into two subproblems by setting 
(r + 1) equal to 1.25 and -1.25.

Subproblem 1
r + 1 = 1.25

Simplifying
r + 1 = 1.25

Reorder the terms:
1 + r = 1.25

Solving
1 + r = 1.25

Solving for variable 'r'.

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

Add '-1' to each side of the equation.
1 + -1 + r = 1.25 + -1

Combine like terms: 1 + -1 = 0
0 + r = 1.25 + -1
r = 1.25 + -1

Combine like terms: 1.25 + -1 = 0.25
r = 0.25

Simplifying
r = 0.25

Subproblem 2
r + 1 = -1.25

Simplifying
r + 1 = -1.25

Reorder the terms:
1 + r = -1.25

Solving
1 + r = -1.25

Solving for variable 'r'.

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

Add '-1' to each side of the equation.
1 + -1 + r = -1.25 + -1

Combine like terms: 1 + -1 = 0
0 + r = -1.25 + -1
r = -1.25 + -1

Combine like terms: -1.25 + -1 = -2.25
r = -2.25

Simplifying
r = -2.25

Solution
The solution to the problem is based on the solutions
from the subproblems.
r = {0.25, -2.25}