9(c-1)c=2

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Solution for 9(c-1)c=2 equation:


Simplifying
9(c + -1) * c = 2

Reorder the terms:
9(-1 + c) * c = 2

Reorder the terms for easier multiplication:
9c(-1 + c) = 2
(-1 * 9c + c * 9c) = 2
(-9c + 9c2) = 2

Solving
-9c + 9c2 = 2

Solving for variable 'c'.

Reorder the terms:
-2 + -9c + 9c2 = 2 + -2

Combine like terms: 2 + -2 = 0
-2 + -9c + 9c2 = 0

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

Divide each side by '9'.
-0.2222222222 + -1c + c2 = 0

Move the constant term to the right:

Add '0.2222222222' to each side of the equation.
-0.2222222222 + -1c + 0.2222222222 + c2 = 0 + 0.2222222222

Reorder the terms:
-0.2222222222 + 0.2222222222 + -1c + c2 = 0 + 0.2222222222

Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000
0.0000000000 + -1c + c2 = 0 + 0.2222222222
-1c + c2 = 0 + 0.2222222222

Combine like terms: 0 + 0.2222222222 = 0.2222222222
-1c + c2 = 0.2222222222

The c term is -1c.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1c + 0.25 + c2 = 0.2222222222 + 0.25

Reorder the terms:
0.25 + -1c + c2 = 0.2222222222 + 0.25

Combine like terms: 0.2222222222 + 0.25 = 0.4722222222
0.25 + -1c + c2 = 0.4722222222

Factor a perfect square on the left side:
(c + -0.5)(c + -0.5) = 0.4722222222

Calculate the square root of the right side: 0.687184271

Break this problem into two subproblems by setting 
(c + -0.5) equal to 0.687184271 and -0.687184271.

Subproblem 1

c + -0.5 = 0.687184271 Simplifying c + -0.5 = 0.687184271 Reorder the terms: -0.5 + c = 0.687184271 Solving -0.5 + c = 0.687184271 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + c = 0.687184271 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + c = 0.687184271 + 0.5 c = 0.687184271 + 0.5 Combine like terms: 0.687184271 + 0.5 = 1.187184271 c = 1.187184271 Simplifying c = 1.187184271

Subproblem 2

c + -0.5 = -0.687184271 Simplifying c + -0.5 = -0.687184271 Reorder the terms: -0.5 + c = -0.687184271 Solving -0.5 + c = -0.687184271 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + c = -0.687184271 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + c = -0.687184271 + 0.5 c = -0.687184271 + 0.5 Combine like terms: -0.687184271 + 0.5 = -0.187184271 c = -0.187184271 Simplifying c = -0.187184271

Solution

The solution to the problem is based on the solutions from the subproblems. c = {1.187184271, -0.187184271}

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