6c^2-2c-15=0

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Solution for 6c^2-2c-15=0 equation:


Simplifying
6c2 + -2c + -15 = 0

Reorder the terms:
-15 + -2c + 6c2 = 0

Solving
-15 + -2c + 6c2 = 0

Solving for variable 'c'.

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

Divide each side by '6'.
-2.5 + -0.3333333333c + c2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -0.3333333333c + 2.5 + c2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -0.3333333333c + c2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -0.3333333333c + c2 = 0 + 2.5
-0.3333333333c + c2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-0.3333333333c + c2 = 2.5

The c term is -0.3333333333c.  Take half its coefficient (-0.1666666667).
Square it (0.02777777779) and add it to both sides.

Add '0.02777777779' to each side of the equation.
-0.3333333333c + 0.02777777779 + c2 = 2.5 + 0.02777777779

Reorder the terms:
0.02777777779 + -0.3333333333c + c2 = 2.5 + 0.02777777779

Combine like terms: 2.5 + 0.02777777779 = 2.52777777779
0.02777777779 + -0.3333333333c + c2 = 2.52777777779

Factor a perfect square on the left side:
(c + -0.1666666667)(c + -0.1666666667) = 2.52777777779

Calculate the square root of the right side: 1.589898669

Break this problem into two subproblems by setting 
(c + -0.1666666667) equal to 1.589898669 and -1.589898669.

Subproblem 1

c + -0.1666666667 = 1.589898669 Simplifying c + -0.1666666667 = 1.589898669 Reorder the terms: -0.1666666667 + c = 1.589898669 Solving -0.1666666667 + c = 1.589898669 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '0.1666666667' to each side of the equation. -0.1666666667 + 0.1666666667 + c = 1.589898669 + 0.1666666667 Combine like terms: -0.1666666667 + 0.1666666667 = 0.0000000000 0.0000000000 + c = 1.589898669 + 0.1666666667 c = 1.589898669 + 0.1666666667 Combine like terms: 1.589898669 + 0.1666666667 = 1.7565653357 c = 1.7565653357 Simplifying c = 1.7565653357

Subproblem 2

c + -0.1666666667 = -1.589898669 Simplifying c + -0.1666666667 = -1.589898669 Reorder the terms: -0.1666666667 + c = -1.589898669 Solving -0.1666666667 + c = -1.589898669 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '0.1666666667' to each side of the equation. -0.1666666667 + 0.1666666667 + c = -1.589898669 + 0.1666666667 Combine like terms: -0.1666666667 + 0.1666666667 = 0.0000000000 0.0000000000 + c = -1.589898669 + 0.1666666667 c = -1.589898669 + 0.1666666667 Combine like terms: -1.589898669 + 0.1666666667 = -1.4232320023 c = -1.4232320023 Simplifying c = -1.4232320023

Solution

The solution to the problem is based on the solutions from the subproblems. c = {1.7565653357, -1.4232320023}

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