4c^2-16c-1=0

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Solution for 4c^2-16c-1=0 equation:


Simplifying
4c2 + -16c + -1 = 0

Reorder the terms:
-1 + -16c + 4c2 = 0

Solving
-1 + -16c + 4c2 = 0

Solving for variable 'c'.

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

Divide each side by '4'.
-0.25 + -4c + c2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + -4c + 0.25 + c2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + -4c + c2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + -4c + c2 = 0 + 0.25
-4c + c2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
-4c + c2 = 0.25

The c term is -4c.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4c + 4 + c2 = 0.25 + 4

Reorder the terms:
4 + -4c + c2 = 0.25 + 4

Combine like terms: 0.25 + 4 = 4.25
4 + -4c + c2 = 4.25

Factor a perfect square on the left side:
(c + -2)(c + -2) = 4.25

Calculate the square root of the right side: 2.061552813

Break this problem into two subproblems by setting 
(c + -2) equal to 2.061552813 and -2.061552813.

Subproblem 1

c + -2 = 2.061552813 Simplifying c + -2 = 2.061552813 Reorder the terms: -2 + c = 2.061552813 Solving -2 + c = 2.061552813 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + c = 2.061552813 + 2 Combine like terms: -2 + 2 = 0 0 + c = 2.061552813 + 2 c = 2.061552813 + 2 Combine like terms: 2.061552813 + 2 = 4.061552813 c = 4.061552813 Simplifying c = 4.061552813

Subproblem 2

c + -2 = -2.061552813 Simplifying c + -2 = -2.061552813 Reorder the terms: -2 + c = -2.061552813 Solving -2 + c = -2.061552813 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + c = -2.061552813 + 2 Combine like terms: -2 + 2 = 0 0 + c = -2.061552813 + 2 c = -2.061552813 + 2 Combine like terms: -2.061552813 + 2 = -0.061552813 c = -0.061552813 Simplifying c = -0.061552813

Solution

The solution to the problem is based on the solutions from the subproblems. c = {4.061552813, -0.061552813}

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