(6c^2-c-1)-(4-2c^2-8c)=

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Solution for (6c^2-c-1)-(4-2c^2-8c)= equation:


Simplifying
(6c2 + -1c + -1) + -1(4 + -2c2 + -8c) = 0

Reorder the terms:
(-1 + -1c + 6c2) + -1(4 + -2c2 + -8c) = 0

Remove parenthesis around (-1 + -1c + 6c2)
-1 + -1c + 6c2 + -1(4 + -2c2 + -8c) = 0

Reorder the terms:
-1 + -1c + 6c2 + -1(4 + -8c + -2c2) = 0
-1 + -1c + 6c2 + (4 * -1 + -8c * -1 + -2c2 * -1) = 0
-1 + -1c + 6c2 + (-4 + 8c + 2c2) = 0

Reorder the terms:
-1 + -4 + -1c + 8c + 6c2 + 2c2 = 0

Combine like terms: -1 + -4 = -5
-5 + -1c + 8c + 6c2 + 2c2 = 0

Combine like terms: -1c + 8c = 7c
-5 + 7c + 6c2 + 2c2 = 0

Combine like terms: 6c2 + 2c2 = 8c2
-5 + 7c + 8c2 = 0

Solving
-5 + 7c + 8c2 = 0

Solving for variable 'c'.

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

Divide each side by '8'.
-0.625 + 0.875c + c2 = 0

Move the constant term to the right:

Add '0.625' to each side of the equation.
-0.625 + 0.875c + 0.625 + c2 = 0 + 0.625

Reorder the terms:
-0.625 + 0.625 + 0.875c + c2 = 0 + 0.625

Combine like terms: -0.625 + 0.625 = 0.000
0.000 + 0.875c + c2 = 0 + 0.625
0.875c + c2 = 0 + 0.625

Combine like terms: 0 + 0.625 = 0.625
0.875c + c2 = 0.625

The c term is 0.875c.  Take half its coefficient (0.4375).
Square it (0.19140625) and add it to both sides.

Add '0.19140625' to each side of the equation.
0.875c + 0.19140625 + c2 = 0.625 + 0.19140625

Reorder the terms:
0.19140625 + 0.875c + c2 = 0.625 + 0.19140625

Combine like terms: 0.625 + 0.19140625 = 0.81640625
0.19140625 + 0.875c + c2 = 0.81640625

Factor a perfect square on the left side:
(c + 0.4375)(c + 0.4375) = 0.81640625

Calculate the square root of the right side: 0.903552018

Break this problem into two subproblems by setting 
(c + 0.4375) equal to 0.903552018 and -0.903552018.

Subproblem 1

c + 0.4375 = 0.903552018 Simplifying c + 0.4375 = 0.903552018 Reorder the terms: 0.4375 + c = 0.903552018 Solving 0.4375 + c = 0.903552018 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-0.4375' to each side of the equation. 0.4375 + -0.4375 + c = 0.903552018 + -0.4375 Combine like terms: 0.4375 + -0.4375 = 0.0000 0.0000 + c = 0.903552018 + -0.4375 c = 0.903552018 + -0.4375 Combine like terms: 0.903552018 + -0.4375 = 0.466052018 c = 0.466052018 Simplifying c = 0.466052018

Subproblem 2

c + 0.4375 = -0.903552018 Simplifying c + 0.4375 = -0.903552018 Reorder the terms: 0.4375 + c = -0.903552018 Solving 0.4375 + c = -0.903552018 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-0.4375' to each side of the equation. 0.4375 + -0.4375 + c = -0.903552018 + -0.4375 Combine like terms: 0.4375 + -0.4375 = 0.0000 0.0000 + c = -0.903552018 + -0.4375 c = -0.903552018 + -0.4375 Combine like terms: -0.903552018 + -0.4375 = -1.341052018 c = -1.341052018 Simplifying c = -1.341052018

Solution

The solution to the problem is based on the solutions from the subproblems. c = {0.466052018, -1.341052018}

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