3c^2+8c-9+c-3+13c^2-5c+9=

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Solution for 3c^2+8c-9+c-3+13c^2-5c+9= equation:


Simplifying
3c2 + 8c + -9 + c + -3 + 13c2 + -5c + 9 = 0

Reorder the terms:
-9 + -3 + 9 + 8c + c + -5c + 3c2 + 13c2 = 0

Combine like terms: -9 + -3 = -12
-12 + 9 + 8c + c + -5c + 3c2 + 13c2 = 0

Combine like terms: -12 + 9 = -3
-3 + 8c + c + -5c + 3c2 + 13c2 = 0

Combine like terms: 8c + c = 9c
-3 + 9c + -5c + 3c2 + 13c2 = 0

Combine like terms: 9c + -5c = 4c
-3 + 4c + 3c2 + 13c2 = 0

Combine like terms: 3c2 + 13c2 = 16c2
-3 + 4c + 16c2 = 0

Solving
-3 + 4c + 16c2 = 0

Solving for variable 'c'.

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

Divide each side by '16'.
-0.1875 + 0.25c + c2 = 0

Move the constant term to the right:

Add '0.1875' to each side of the equation.
-0.1875 + 0.25c + 0.1875 + c2 = 0 + 0.1875

Reorder the terms:
-0.1875 + 0.1875 + 0.25c + c2 = 0 + 0.1875

Combine like terms: -0.1875 + 0.1875 = 0.0000
0.0000 + 0.25c + c2 = 0 + 0.1875
0.25c + c2 = 0 + 0.1875

Combine like terms: 0 + 0.1875 = 0.1875
0.25c + c2 = 0.1875

The c term is 0.25c.  Take half its coefficient (0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
0.25c + 0.015625 + c2 = 0.1875 + 0.015625

Reorder the terms:
0.015625 + 0.25c + c2 = 0.1875 + 0.015625

Combine like terms: 0.1875 + 0.015625 = 0.203125
0.015625 + 0.25c + c2 = 0.203125

Factor a perfect square on the left side:
(c + 0.125)(c + 0.125) = 0.203125

Calculate the square root of the right side: 0.450693909

Break this problem into two subproblems by setting 
(c + 0.125) equal to 0.450693909 and -0.450693909.

Subproblem 1

c + 0.125 = 0.450693909 Simplifying c + 0.125 = 0.450693909 Reorder the terms: 0.125 + c = 0.450693909 Solving 0.125 + c = 0.450693909 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + c = 0.450693909 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + c = 0.450693909 + -0.125 c = 0.450693909 + -0.125 Combine like terms: 0.450693909 + -0.125 = 0.325693909 c = 0.325693909 Simplifying c = 0.325693909

Subproblem 2

c + 0.125 = -0.450693909 Simplifying c + 0.125 = -0.450693909 Reorder the terms: 0.125 + c = -0.450693909 Solving 0.125 + c = -0.450693909 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + c = -0.450693909 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + c = -0.450693909 + -0.125 c = -0.450693909 + -0.125 Combine like terms: -0.450693909 + -0.125 = -0.575693909 c = -0.575693909 Simplifying c = -0.575693909

Solution

The solution to the problem is based on the solutions from the subproblems. c = {0.325693909, -0.575693909}

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