(5c^2-10-2c)=0

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


Simplifying
(5c2 + -10 + -2c) = 0

Reorder the terms:
(-10 + -2c + 5c2) = 0

Remove parenthesis around (-10 + -2c + 5c2)
-10 + -2c + 5c2 = 0

Solving
-10 + -2c + 5c2 = 0

Solving for variable 'c'.

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

Divide each side by '5'.
-2 + -0.4c + c2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -0.4c + 2 + c2 = 0 + 2

Reorder the terms:
-2 + 2 + -0.4c + c2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -0.4c + c2 = 0 + 2
-0.4c + c2 = 0 + 2

Combine like terms: 0 + 2 = 2
-0.4c + c2 = 2

The c term is -0.4c.  Take half its coefficient (-0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
-0.4c + 0.04 + c2 = 2 + 0.04

Reorder the terms:
0.04 + -0.4c + c2 = 2 + 0.04

Combine like terms: 2 + 0.04 = 2.04
0.04 + -0.4c + c2 = 2.04

Factor a perfect square on the left side:
(c + -0.2)(c + -0.2) = 2.04

Calculate the square root of the right side: 1.428285686

Break this problem into two subproblems by setting 
(c + -0.2) equal to 1.428285686 and -1.428285686.

Subproblem 1

c + -0.2 = 1.428285686 Simplifying c + -0.2 = 1.428285686 Reorder the terms: -0.2 + c = 1.428285686 Solving -0.2 + c = 1.428285686 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + c = 1.428285686 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + c = 1.428285686 + 0.2 c = 1.428285686 + 0.2 Combine like terms: 1.428285686 + 0.2 = 1.628285686 c = 1.628285686 Simplifying c = 1.628285686

Subproblem 2

c + -0.2 = -1.428285686 Simplifying c + -0.2 = -1.428285686 Reorder the terms: -0.2 + c = -1.428285686 Solving -0.2 + c = -1.428285686 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + c = -1.428285686 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + c = -1.428285686 + 0.2 c = -1.428285686 + 0.2 Combine like terms: -1.428285686 + 0.2 = -1.228285686 c = -1.228285686 Simplifying c = -1.228285686

Solution

The solution to the problem is based on the solutions from the subproblems. c = {1.628285686, -1.228285686}

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