2c(4c-1)-6=5c+4

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Solution for 2c(4c-1)-6=5c+4 equation:


Simplifying
2c(4c + -1) + -6 = 5c + 4

Reorder the terms:
2c(-1 + 4c) + -6 = 5c + 4
(-1 * 2c + 4c * 2c) + -6 = 5c + 4
(-2c + 8c2) + -6 = 5c + 4

Reorder the terms:
-6 + -2c + 8c2 = 5c + 4

Reorder the terms:
-6 + -2c + 8c2 = 4 + 5c

Solving
-6 + -2c + 8c2 = 4 + 5c

Solving for variable 'c'.

Reorder the terms:
-6 + -4 + -2c + -5c + 8c2 = 4 + 5c + -4 + -5c

Combine like terms: -6 + -4 = -10
-10 + -2c + -5c + 8c2 = 4 + 5c + -4 + -5c

Combine like terms: -2c + -5c = -7c
-10 + -7c + 8c2 = 4 + 5c + -4 + -5c

Reorder the terms:
-10 + -7c + 8c2 = 4 + -4 + 5c + -5c

Combine like terms: 4 + -4 = 0
-10 + -7c + 8c2 = 0 + 5c + -5c
-10 + -7c + 8c2 = 5c + -5c

Combine like terms: 5c + -5c = 0
-10 + -7c + 8c2 = 0

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

Divide each side by '8'.
-1.25 + -0.875c + c2 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + -0.875c + 1.25 + c2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + -0.875c + c2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + -0.875c + c2 = 0 + 1.25
-0.875c + c2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
-0.875c + c2 = 1.25

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 = 1.25 + 0.19140625

Reorder the terms:
0.19140625 + -0.875c + c2 = 1.25 + 0.19140625

Combine like terms: 1.25 + 0.19140625 = 1.44140625
0.19140625 + -0.875c + c2 = 1.44140625

Factor a perfect square on the left side:
(c + -0.4375)(c + -0.4375) = 1.44140625

Calculate the square root of the right side: 1.200585795

Break this problem into two subproblems by setting 
(c + -0.4375) equal to 1.200585795 and -1.200585795.

Subproblem 1

c + -0.4375 = 1.200585795 Simplifying c + -0.4375 = 1.200585795 Reorder the terms: -0.4375 + c = 1.200585795 Solving -0.4375 + c = 1.200585795 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 = 1.200585795 + 0.4375 Combine like terms: -0.4375 + 0.4375 = 0.0000 0.0000 + c = 1.200585795 + 0.4375 c = 1.200585795 + 0.4375 Combine like terms: 1.200585795 + 0.4375 = 1.638085795 c = 1.638085795 Simplifying c = 1.638085795

Subproblem 2

c + -0.4375 = -1.200585795 Simplifying c + -0.4375 = -1.200585795 Reorder the terms: -0.4375 + c = -1.200585795 Solving -0.4375 + c = -1.200585795 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 = -1.200585795 + 0.4375 Combine like terms: -0.4375 + 0.4375 = 0.0000 0.0000 + c = -1.200585795 + 0.4375 c = -1.200585795 + 0.4375 Combine like terms: -1.200585795 + 0.4375 = -0.763085795 c = -0.763085795 Simplifying c = -0.763085795

Solution

The solution to the problem is based on the solutions from the subproblems. c = {1.638085795, -0.763085795}

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