x^2+6x=104

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Solution for x^2+6x=104 equation:


Simplifying
x2 + 6x = 104

Reorder the terms:
6x + x2 = 104

Solving
6x + x2 = 104

Solving for variable 'x'.

Reorder the terms:
-104 + 6x + x2 = 104 + -104

Combine like terms: 104 + -104 = 0
-104 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '104' to each side of the equation.
-104 + 6x + 104 + x2 = 0 + 104

Reorder the terms:
-104 + 104 + 6x + x2 = 0 + 104

Combine like terms: -104 + 104 = 0
0 + 6x + x2 = 0 + 104
6x + x2 = 0 + 104

Combine like terms: 0 + 104 = 104
6x + x2 = 104

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 = 104 + 9

Reorder the terms:
9 + 6x + x2 = 104 + 9

Combine like terms: 104 + 9 = 113
9 + 6x + x2 = 113

Factor a perfect square on the left side:
(x + 3)(x + 3) = 113

Calculate the square root of the right side: 10.630145813

Break this problem into two subproblems by setting 
(x + 3) equal to 10.630145813 and -10.630145813.

Subproblem 1

x + 3 = 10.630145813 Simplifying x + 3 = 10.630145813 Reorder the terms: 3 + x = 10.630145813 Solving 3 + x = 10.630145813 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 = 10.630145813 + -3 Combine like terms: 3 + -3 = 0 0 + x = 10.630145813 + -3 x = 10.630145813 + -3 Combine like terms: 10.630145813 + -3 = 7.630145813 x = 7.630145813 Simplifying x = 7.630145813

Subproblem 2

x + 3 = -10.630145813 Simplifying x + 3 = -10.630145813 Reorder the terms: 3 + x = -10.630145813 Solving 3 + x = -10.630145813 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 = -10.630145813 + -3 Combine like terms: 3 + -3 = 0 0 + x = -10.630145813 + -3 x = -10.630145813 + -3 Combine like terms: -10.630145813 + -3 = -13.630145813 x = -13.630145813 Simplifying x = -13.630145813

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.630145813, -13.630145813}

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