c^2-26c=18

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Solution for c^2-26c=18 equation:


Simplifying
c2 + -26c = 18

Reorder the terms:
-26c + c2 = 18

Solving
-26c + c2 = 18

Solving for variable 'c'.

Reorder the terms:
-18 + -26c + c2 = 18 + -18

Combine like terms: 18 + -18 = 0
-18 + -26c + c2 = 0

Begin completing the square.

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + -26c + 18 + c2 = 0 + 18

Reorder the terms:
-18 + 18 + -26c + c2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + -26c + c2 = 0 + 18
-26c + c2 = 0 + 18

Combine like terms: 0 + 18 = 18
-26c + c2 = 18

The c term is -26c.  Take half its coefficient (-13).
Square it (169) and add it to both sides.

Add '169' to each side of the equation.
-26c + 169 + c2 = 18 + 169

Reorder the terms:
169 + -26c + c2 = 18 + 169

Combine like terms: 18 + 169 = 187
169 + -26c + c2 = 187

Factor a perfect square on the left side:
(c + -13)(c + -13) = 187

Calculate the square root of the right side: 13.674794331

Break this problem into two subproblems by setting 
(c + -13) equal to 13.674794331 and -13.674794331.

Subproblem 1

c + -13 = 13.674794331 Simplifying c + -13 = 13.674794331 Reorder the terms: -13 + c = 13.674794331 Solving -13 + c = 13.674794331 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + c = 13.674794331 + 13 Combine like terms: -13 + 13 = 0 0 + c = 13.674794331 + 13 c = 13.674794331 + 13 Combine like terms: 13.674794331 + 13 = 26.674794331 c = 26.674794331 Simplifying c = 26.674794331

Subproblem 2

c + -13 = -13.674794331 Simplifying c + -13 = -13.674794331 Reorder the terms: -13 + c = -13.674794331 Solving -13 + c = -13.674794331 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + c = -13.674794331 + 13 Combine like terms: -13 + 13 = 0 0 + c = -13.674794331 + 13 c = -13.674794331 + 13 Combine like terms: -13.674794331 + 13 = -0.674794331 c = -0.674794331 Simplifying c = -0.674794331

Solution

The solution to the problem is based on the solutions from the subproblems. c = {26.674794331, -0.674794331}

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