c(c+12)=2c+18

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Solution for c(c+12)=2c+18 equation:


Simplifying
c(c + 12) = 2c + 18

Reorder the terms:
c(12 + c) = 2c + 18
(12 * c + c * c) = 2c + 18
(12c + c2) = 2c + 18

Reorder the terms:
12c + c2 = 18 + 2c

Solving
12c + c2 = 18 + 2c

Solving for variable 'c'.

Reorder the terms:
-18 + 12c + -2c + c2 = 18 + 2c + -18 + -2c

Combine like terms: 12c + -2c = 10c
-18 + 10c + c2 = 18 + 2c + -18 + -2c

Reorder the terms:
-18 + 10c + c2 = 18 + -18 + 2c + -2c

Combine like terms: 18 + -18 = 0
-18 + 10c + c2 = 0 + 2c + -2c
-18 + 10c + c2 = 2c + -2c

Combine like terms: 2c + -2c = 0
-18 + 10c + c2 = 0

Begin completing the square.

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + 10c + 18 + c2 = 0 + 18

Reorder the terms:
-18 + 18 + 10c + c2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + 10c + c2 = 0 + 18
10c + c2 = 0 + 18

Combine like terms: 0 + 18 = 18
10c + c2 = 18

The c term is 10c.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10c + 25 + c2 = 18 + 25

Reorder the terms:
25 + 10c + c2 = 18 + 25

Combine like terms: 18 + 25 = 43
25 + 10c + c2 = 43

Factor a perfect square on the left side:
(c + 5)(c + 5) = 43

Calculate the square root of the right side: 6.557438524

Break this problem into two subproblems by setting 
(c + 5) equal to 6.557438524 and -6.557438524.

Subproblem 1

c + 5 = 6.557438524 Simplifying c + 5 = 6.557438524 Reorder the terms: 5 + c = 6.557438524 Solving 5 + c = 6.557438524 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + c = 6.557438524 + -5 Combine like terms: 5 + -5 = 0 0 + c = 6.557438524 + -5 c = 6.557438524 + -5 Combine like terms: 6.557438524 + -5 = 1.557438524 c = 1.557438524 Simplifying c = 1.557438524

Subproblem 2

c + 5 = -6.557438524 Simplifying c + 5 = -6.557438524 Reorder the terms: 5 + c = -6.557438524 Solving 5 + c = -6.557438524 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + c = -6.557438524 + -5 Combine like terms: 5 + -5 = 0 0 + c = -6.557438524 + -5 c = -6.557438524 + -5 Combine like terms: -6.557438524 + -5 = -11.557438524 c = -11.557438524 Simplifying c = -11.557438524

Solution

The solution to the problem is based on the solutions from the subproblems. c = {1.557438524, -11.557438524}

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