(c-12)c-15=0

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Solution for (c-12)c-15=0 equation:


Simplifying
(c + -12) * c + -15 = 0

Reorder the terms:
(-12 + c) * c + -15 = 0

Reorder the terms for easier multiplication:
c(-12 + c) + -15 = 0
(-12 * c + c * c) + -15 = 0
(-12c + c2) + -15 = 0

Reorder the terms:
-15 + -12c + c2 = 0

Solving
-15 + -12c + c2 = 0

Solving for variable 'c'.

Begin completing the square.

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + -12c + 15 + c2 = 0 + 15

Reorder the terms:
-15 + 15 + -12c + c2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + -12c + c2 = 0 + 15
-12c + c2 = 0 + 15

Combine like terms: 0 + 15 = 15
-12c + c2 = 15

The c term is -12c.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12c + 36 + c2 = 15 + 36

Reorder the terms:
36 + -12c + c2 = 15 + 36

Combine like terms: 15 + 36 = 51
36 + -12c + c2 = 51

Factor a perfect square on the left side:
(c + -6)(c + -6) = 51

Calculate the square root of the right side: 7.141428429

Break this problem into two subproblems by setting 
(c + -6) equal to 7.141428429 and -7.141428429.

Subproblem 1

c + -6 = 7.141428429 Simplifying c + -6 = 7.141428429 Reorder the terms: -6 + c = 7.141428429 Solving -6 + c = 7.141428429 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + c = 7.141428429 + 6 Combine like terms: -6 + 6 = 0 0 + c = 7.141428429 + 6 c = 7.141428429 + 6 Combine like terms: 7.141428429 + 6 = 13.141428429 c = 13.141428429 Simplifying c = 13.141428429

Subproblem 2

c + -6 = -7.141428429 Simplifying c + -6 = -7.141428429 Reorder the terms: -6 + c = -7.141428429 Solving -6 + c = -7.141428429 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + c = -7.141428429 + 6 Combine like terms: -6 + 6 = 0 0 + c = -7.141428429 + 6 c = -7.141428429 + 6 Combine like terms: -7.141428429 + 6 = -1.141428429 c = -1.141428429 Simplifying c = -1.141428429

Solution

The solution to the problem is based on the solutions from the subproblems. c = {13.141428429, -1.141428429}

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