2c^2-c-2=0

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Solution for 2c^2-c-2=0 equation:


Simplifying
2c2 + -1c + -2 = 0

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

Solving
-2 + -1c + 2c2 = 0

Solving for variable 'c'.

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

Divide each side by '2'.
-1 + -0.5c + c2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -0.5c + 1 + c2 = 0 + 1

Reorder the terms:
-1 + 1 + -0.5c + c2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -0.5c + c2 = 0 + 1
-0.5c + c2 = 0 + 1

Combine like terms: 0 + 1 = 1
-0.5c + c2 = 1

The c term is -0.5c.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5c + 0.0625 + c2 = 1 + 0.0625

Reorder the terms:
0.0625 + -0.5c + c2 = 1 + 0.0625

Combine like terms: 1 + 0.0625 = 1.0625
0.0625 + -0.5c + c2 = 1.0625

Factor a perfect square on the left side:
(c + -0.25)(c + -0.25) = 1.0625

Calculate the square root of the right side: 1.030776406

Break this problem into two subproblems by setting 
(c + -0.25) equal to 1.030776406 and -1.030776406.

Subproblem 1

c + -0.25 = 1.030776406 Simplifying c + -0.25 = 1.030776406 Reorder the terms: -0.25 + c = 1.030776406 Solving -0.25 + c = 1.030776406 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + c = 1.030776406 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + c = 1.030776406 + 0.25 c = 1.030776406 + 0.25 Combine like terms: 1.030776406 + 0.25 = 1.280776406 c = 1.280776406 Simplifying c = 1.280776406

Subproblem 2

c + -0.25 = -1.030776406 Simplifying c + -0.25 = -1.030776406 Reorder the terms: -0.25 + c = -1.030776406 Solving -0.25 + c = -1.030776406 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + c = -1.030776406 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + c = -1.030776406 + 0.25 c = -1.030776406 + 0.25 Combine like terms: -1.030776406 + 0.25 = -0.780776406 c = -0.780776406 Simplifying c = -0.780776406

Solution

The solution to the problem is based on the solutions from the subproblems. c = {1.280776406, -0.780776406}

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