3c^2-2c-12=0

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Solution for 3c^2-2c-12=0 equation:


Simplifying
3c2 + -2c + -12 = 0

Reorder the terms:
-12 + -2c + 3c2 = 0

Solving
-12 + -2c + 3c2 = 0

Solving for variable 'c'.

Begin completing the square.  Divide all terms by
3 the coefficient of the squared term: 

Divide each side by '3'.
-4 + -0.6666666667c + c2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -0.6666666667c + 4 + c2 = 0 + 4

Reorder the terms:
-4 + 4 + -0.6666666667c + c2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -0.6666666667c + c2 = 0 + 4
-0.6666666667c + c2 = 0 + 4

Combine like terms: 0 + 4 = 4
-0.6666666667c + c2 = 4

The c term is -0.6666666667c.  Take half its coefficient (-0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
-0.6666666667c + 0.1111111112 + c2 = 4 + 0.1111111112

Reorder the terms:
0.1111111112 + -0.6666666667c + c2 = 4 + 0.1111111112

Combine like terms: 4 + 0.1111111112 = 4.1111111112
0.1111111112 + -0.6666666667c + c2 = 4.1111111112

Factor a perfect square on the left side:
(c + -0.3333333334)(c + -0.3333333334) = 4.1111111112

Calculate the square root of the right side: 2.02758751

Break this problem into two subproblems by setting 
(c + -0.3333333334) equal to 2.02758751 and -2.02758751.

Subproblem 1

c + -0.3333333334 = 2.02758751 Simplifying c + -0.3333333334 = 2.02758751 Reorder the terms: -0.3333333334 + c = 2.02758751 Solving -0.3333333334 + c = 2.02758751 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '0.3333333334' to each side of the equation. -0.3333333334 + 0.3333333334 + c = 2.02758751 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + c = 2.02758751 + 0.3333333334 c = 2.02758751 + 0.3333333334 Combine like terms: 2.02758751 + 0.3333333334 = 2.3609208434 c = 2.3609208434 Simplifying c = 2.3609208434

Subproblem 2

c + -0.3333333334 = -2.02758751 Simplifying c + -0.3333333334 = -2.02758751 Reorder the terms: -0.3333333334 + c = -2.02758751 Solving -0.3333333334 + c = -2.02758751 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '0.3333333334' to each side of the equation. -0.3333333334 + 0.3333333334 + c = -2.02758751 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + c = -2.02758751 + 0.3333333334 c = -2.02758751 + 0.3333333334 Combine like terms: -2.02758751 + 0.3333333334 = -1.6942541766 c = -1.6942541766 Simplifying c = -1.6942541766

Solution

The solution to the problem is based on the solutions from the subproblems. c = {2.3609208434, -1.6942541766}

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