x^2+6x+c=13+c

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Solution for x^2+6x+c=13+c equation:


Simplifying
x2 + 6x + c = 13 + c

Reorder the terms:
c + 6x + x2 = 13 + c

Add '-1c' to each side of the equation.
c + 6x + -1c + x2 = 13 + c + -1c

Reorder the terms:
c + -1c + 6x + x2 = 13 + c + -1c

Combine like terms: c + -1c = 0
0 + 6x + x2 = 13 + c + -1c
6x + x2 = 13 + c + -1c

Combine like terms: c + -1c = 0
6x + x2 = 13 + 0
6x + x2 = 13

Solving
6x + x2 = 13

Solving for variable 'x'.

Reorder the terms:
-13 + 6x + x2 = 13 + -13

Combine like terms: 13 + -13 = 0
-13 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + 6x + 13 + x2 = 0 + 13

Reorder the terms:
-13 + 13 + 6x + x2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + 6x + x2 = 0 + 13
6x + x2 = 0 + 13

Combine like terms: 0 + 13 = 13
6x + x2 = 13

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 13 + 9

Reorder the terms:
9 + 6x + x2 = 13 + 9

Combine like terms: 13 + 9 = 22
9 + 6x + x2 = 22

Factor a perfect square on the left side:
(x + 3)(x + 3) = 22

Calculate the square root of the right side: 4.69041576

Break this problem into two subproblems by setting 
(x + 3) equal to 4.69041576 and -4.69041576.

Subproblem 1

x + 3 = 4.69041576 Simplifying x + 3 = 4.69041576 Reorder the terms: 3 + x = 4.69041576 Solving 3 + x = 4.69041576 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 4.69041576 + -3 Combine like terms: 3 + -3 = 0 0 + x = 4.69041576 + -3 x = 4.69041576 + -3 Combine like terms: 4.69041576 + -3 = 1.69041576 x = 1.69041576 Simplifying x = 1.69041576

Subproblem 2

x + 3 = -4.69041576 Simplifying x + 3 = -4.69041576 Reorder the terms: 3 + x = -4.69041576 Solving 3 + x = -4.69041576 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -4.69041576 + -3 Combine like terms: 3 + -3 = 0 0 + x = -4.69041576 + -3 x = -4.69041576 + -3 Combine like terms: -4.69041576 + -3 = -7.69041576 x = -7.69041576 Simplifying x = -7.69041576

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.69041576, -7.69041576}

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