4c^2-5c-10=0

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Solution for 4c^2-5c-10=0 equation:


Simplifying
4c2 + -5c + -10 = 0

Reorder the terms:
-10 + -5c + 4c2 = 0

Solving
-10 + -5c + 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'.
-2.5 + -1.25c + c2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -1.25c + 2.5 + c2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -1.25c + c2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -1.25c + c2 = 0 + 2.5
-1.25c + c2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-1.25c + c2 = 2.5

The c term is -1.25c.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25c + 0.390625 + c2 = 2.5 + 0.390625

Reorder the terms:
0.390625 + -1.25c + c2 = 2.5 + 0.390625

Combine like terms: 2.5 + 0.390625 = 2.890625
0.390625 + -1.25c + c2 = 2.890625

Factor a perfect square on the left side:
(c + -0.625)(c + -0.625) = 2.890625

Calculate the square root of the right side: 1.700183814

Break this problem into two subproblems by setting 
(c + -0.625) equal to 1.700183814 and -1.700183814.

Subproblem 1

c + -0.625 = 1.700183814 Simplifying c + -0.625 = 1.700183814 Reorder the terms: -0.625 + c = 1.700183814 Solving -0.625 + c = 1.700183814 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + c = 1.700183814 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + c = 1.700183814 + 0.625 c = 1.700183814 + 0.625 Combine like terms: 1.700183814 + 0.625 = 2.325183814 c = 2.325183814 Simplifying c = 2.325183814

Subproblem 2

c + -0.625 = -1.700183814 Simplifying c + -0.625 = -1.700183814 Reorder the terms: -0.625 + c = -1.700183814 Solving -0.625 + c = -1.700183814 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + c = -1.700183814 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + c = -1.700183814 + 0.625 c = -1.700183814 + 0.625 Combine like terms: -1.700183814 + 0.625 = -1.075183814 c = -1.075183814 Simplifying c = -1.075183814

Solution

The solution to the problem is based on the solutions from the subproblems. c = {2.325183814, -1.075183814}

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