x^2+4x=104

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Solution for x^2+4x=104 equation:


Simplifying
x2 + 4x = 104

Reorder the terms:
4x + x2 = 104

Solving
4x + x2 = 104

Solving for variable 'x'.

Reorder the terms:
-104 + 4x + x2 = 104 + -104

Combine like terms: 104 + -104 = 0
-104 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '104' to each side of the equation.
-104 + 4x + 104 + x2 = 0 + 104

Reorder the terms:
-104 + 104 + 4x + x2 = 0 + 104

Combine like terms: -104 + 104 = 0
0 + 4x + x2 = 0 + 104
4x + x2 = 0 + 104

Combine like terms: 0 + 104 = 104
4x + x2 = 104

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 104 + 4

Reorder the terms:
4 + 4x + x2 = 104 + 4

Combine like terms: 104 + 4 = 108
4 + 4x + x2 = 108

Factor a perfect square on the left side:
(x + 2)(x + 2) = 108

Calculate the square root of the right side: 10.392304845

Break this problem into two subproblems by setting 
(x + 2) equal to 10.392304845 and -10.392304845.

Subproblem 1

x + 2 = 10.392304845 Simplifying x + 2 = 10.392304845 Reorder the terms: 2 + x = 10.392304845 Solving 2 + x = 10.392304845 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 10.392304845 + -2 Combine like terms: 2 + -2 = 0 0 + x = 10.392304845 + -2 x = 10.392304845 + -2 Combine like terms: 10.392304845 + -2 = 8.392304845 x = 8.392304845 Simplifying x = 8.392304845

Subproblem 2

x + 2 = -10.392304845 Simplifying x + 2 = -10.392304845 Reorder the terms: 2 + x = -10.392304845 Solving 2 + x = -10.392304845 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -10.392304845 + -2 Combine like terms: 2 + -2 = 0 0 + x = -10.392304845 + -2 x = -10.392304845 + -2 Combine like terms: -10.392304845 + -2 = -12.392304845 x = -12.392304845 Simplifying x = -12.392304845

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.392304845, -12.392304845}

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