c^2-5c=-2

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Solution for c^2-5c=-2 equation: 


Simplifying
c2 + -5c = -2

Reorder the terms:
-5c + c2 = -2

Solving
-5c + c2 = -2

Solving for variable 'c'.

Reorder the terms:
2 + -5c + c2 = -2 + 2

Combine like terms: -2 + 2 = 0
2 + -5c + c2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + -5c + -2 + c2 = 0 + -2

Reorder the terms:
2 + -2 + -5c + c2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -5c + c2 = 0 + -2
-5c + c2 = 0 + -2

Combine like terms: 0 + -2 = -2
-5c + c2 = -2

The c term is -5c.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5c + 6.25 + c2 = -2 + 6.25

Reorder the terms:
6.25 + -5c + c2 = -2 + 6.25

Combine like terms: -2 + 6.25 = 4.25
6.25 + -5c + c2 = 4.25

Factor a perfect square on the left side:
(c + -2.5)(c + -2.5) = 4.25

Calculate the square root of the right side: 2.061552813

Break this problem into two subproblems by setting 
(c + -2.5) equal to 2.061552813 and -2.061552813.


Subproblem 1
c + -2.5 = 2.061552813

Simplifying
c + -2.5 = 2.061552813

Reorder the terms:
-2.5 + c = 2.061552813

Solving
-2.5 + c = 2.061552813

Solving for variable 'c'.

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

Add '2.5' to each side of the equation.
-2.5 + 2.5 + c = 2.061552813 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + c = 2.061552813 + 2.5
c = 2.061552813 + 2.5

Combine like terms: 2.061552813 + 2.5 = 4.561552813
c = 4.561552813

Simplifying
c = 4.561552813


Subproblem 2
c + -2.5 = -2.061552813

Simplifying
c + -2.5 = -2.061552813

Reorder the terms:
-2.5 + c = -2.061552813

Solving
-2.5 + c = -2.061552813

Solving for variable 'c'.

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

Add '2.5' to each side of the equation.
-2.5 + 2.5 + c = -2.061552813 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + c = -2.061552813 + 2.5
c = -2.061552813 + 2.5

Combine like terms: -2.061552813 + 2.5 = 0.438447187
c = 0.438447187

Simplifying
c = 0.438447187


Solution
The solution to the problem is based on the solutions
from the subproblems.
c = {4.561552813, 0.438447187}

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