c^2=36-13c

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Solution for c^2=36-13c equation:


Simplifying
c2 = 36 + -13c

Solving
c2 = 36 + -13c

Solving for variable 'c'.

Reorder the terms:
-36 + 13c + c2 = 36 + -13c + -36 + 13c

Reorder the terms:
-36 + 13c + c2 = 36 + -36 + -13c + 13c

Combine like terms: 36 + -36 = 0
-36 + 13c + c2 = 0 + -13c + 13c
-36 + 13c + c2 = -13c + 13c

Combine like terms: -13c + 13c = 0
-36 + 13c + c2 = 0

Begin completing the square.

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + 13c + 36 + c2 = 0 + 36

Reorder the terms:
-36 + 36 + 13c + c2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + 13c + c2 = 0 + 36
13c + c2 = 0 + 36

Combine like terms: 0 + 36 = 36
13c + c2 = 36

The c term is 13c.  Take half its coefficient (6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
13c + 42.25 + c2 = 36 + 42.25

Reorder the terms:
42.25 + 13c + c2 = 36 + 42.25

Combine like terms: 36 + 42.25 = 78.25
42.25 + 13c + c2 = 78.25

Factor a perfect square on the left side:
(c + 6.5)(c + 6.5) = 78.25

Calculate the square root of the right side: 8.845903006

Break this problem into two subproblems by setting 
(c + 6.5) equal to 8.845903006 and -8.845903006.

Subproblem 1

c + 6.5 = 8.845903006 Simplifying c + 6.5 = 8.845903006 Reorder the terms: 6.5 + c = 8.845903006 Solving 6.5 + c = 8.845903006 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + c = 8.845903006 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + c = 8.845903006 + -6.5 c = 8.845903006 + -6.5 Combine like terms: 8.845903006 + -6.5 = 2.345903006 c = 2.345903006 Simplifying c = 2.345903006

Subproblem 2

c + 6.5 = -8.845903006 Simplifying c + 6.5 = -8.845903006 Reorder the terms: 6.5 + c = -8.845903006 Solving 6.5 + c = -8.845903006 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + c = -8.845903006 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + c = -8.845903006 + -6.5 c = -8.845903006 + -6.5 Combine like terms: -8.845903006 + -6.5 = -15.345903006 c = -15.345903006 Simplifying c = -15.345903006

Solution

The solution to the problem is based on the solutions from the subproblems. c = {2.345903006, -15.345903006}

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