2c^2-11c=5

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Solution for 2c^2-11c=5 equation:


Simplifying
2c2 + -11c = 5

Reorder the terms:
-11c + 2c2 = 5

Solving
-11c + 2c2 = 5

Solving for variable 'c'.

Reorder the terms:
-5 + -11c + 2c2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + -11c + 2c2 = 0

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

Divide each side by '2'.
-2.5 + -5.5c + c2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -5.5c + 2.5 + c2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -5.5c + c2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -5.5c + c2 = 0 + 2.5
-5.5c + c2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-5.5c + c2 = 2.5

The c term is -5.5c.  Take half its coefficient (-2.75).
Square it (7.5625) and add it to both sides.

Add '7.5625' to each side of the equation.
-5.5c + 7.5625 + c2 = 2.5 + 7.5625

Reorder the terms:
7.5625 + -5.5c + c2 = 2.5 + 7.5625

Combine like terms: 2.5 + 7.5625 = 10.0625
7.5625 + -5.5c + c2 = 10.0625

Factor a perfect square on the left side:
(c + -2.75)(c + -2.75) = 10.0625

Calculate the square root of the right side: 3.172144385

Break this problem into two subproblems by setting 
(c + -2.75) equal to 3.172144385 and -3.172144385.

Subproblem 1

c + -2.75 = 3.172144385 Simplifying c + -2.75 = 3.172144385 Reorder the terms: -2.75 + c = 3.172144385 Solving -2.75 + c = 3.172144385 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + c = 3.172144385 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + c = 3.172144385 + 2.75 c = 3.172144385 + 2.75 Combine like terms: 3.172144385 + 2.75 = 5.922144385 c = 5.922144385 Simplifying c = 5.922144385

Subproblem 2

c + -2.75 = -3.172144385 Simplifying c + -2.75 = -3.172144385 Reorder the terms: -2.75 + c = -3.172144385 Solving -2.75 + c = -3.172144385 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + c = -3.172144385 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + c = -3.172144385 + 2.75 c = -3.172144385 + 2.75 Combine like terms: -3.172144385 + 2.75 = -0.422144385 c = -0.422144385 Simplifying c = -0.422144385

Solution

The solution to the problem is based on the solutions from the subproblems. c = {5.922144385, -0.422144385}

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