9c+c(2c-3)=9

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Solution for 9c+c(2c-3)=9 equation:


Simplifying
9c + c(2c + -3) = 9

Reorder the terms:
9c + c(-3 + 2c) = 9
9c + (-3 * c + 2c * c) = 9
9c + (-3c + 2c2) = 9

Combine like terms: 9c + -3c = 6c
6c + 2c2 = 9

Solving
6c + 2c2 = 9

Solving for variable 'c'.

Reorder the terms:
-9 + 6c + 2c2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + 6c + 2c2 = 0

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

Divide each side by '2'.
-4.5 + 3c + c2 = 0

Move the constant term to the right:

Add '4.5' to each side of the equation.
-4.5 + 3c + 4.5 + c2 = 0 + 4.5

Reorder the terms:
-4.5 + 4.5 + 3c + c2 = 0 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + 3c + c2 = 0 + 4.5
3c + c2 = 0 + 4.5

Combine like terms: 0 + 4.5 = 4.5
3c + c2 = 4.5

The c term is 3c.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3c + 2.25 + c2 = 4.5 + 2.25

Reorder the terms:
2.25 + 3c + c2 = 4.5 + 2.25

Combine like terms: 4.5 + 2.25 = 6.75
2.25 + 3c + c2 = 6.75

Factor a perfect square on the left side:
(c + 1.5)(c + 1.5) = 6.75

Calculate the square root of the right side: 2.598076211

Break this problem into two subproblems by setting 
(c + 1.5) equal to 2.598076211 and -2.598076211.

Subproblem 1

c + 1.5 = 2.598076211 Simplifying c + 1.5 = 2.598076211 Reorder the terms: 1.5 + c = 2.598076211 Solving 1.5 + c = 2.598076211 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + c = 2.598076211 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + c = 2.598076211 + -1.5 c = 2.598076211 + -1.5 Combine like terms: 2.598076211 + -1.5 = 1.098076211 c = 1.098076211 Simplifying c = 1.098076211

Subproblem 2

c + 1.5 = -2.598076211 Simplifying c + 1.5 = -2.598076211 Reorder the terms: 1.5 + c = -2.598076211 Solving 1.5 + c = -2.598076211 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + c = -2.598076211 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + c = -2.598076211 + -1.5 c = -2.598076211 + -1.5 Combine like terms: -2.598076211 + -1.5 = -4.098076211 c = -4.098076211 Simplifying c = -4.098076211

Solution

The solution to the problem is based on the solutions from the subproblems. c = {1.098076211, -4.098076211}

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