x(x+2)=124

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Solution for x(x+2)=124 equation:


Simplifying
x(x + 2) = 124

Reorder the terms:
x(2 + x) = 124
(2 * x + x * x) = 124
(2x + x2) = 124

Solving
2x + x2 = 124

Solving for variable 'x'.

Reorder the terms:
-124 + 2x + x2 = 124 + -124

Combine like terms: 124 + -124 = 0
-124 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '124' to each side of the equation.
-124 + 2x + 124 + x2 = 0 + 124

Reorder the terms:
-124 + 124 + 2x + x2 = 0 + 124

Combine like terms: -124 + 124 = 0
0 + 2x + x2 = 0 + 124
2x + x2 = 0 + 124

Combine like terms: 0 + 124 = 124
2x + x2 = 124

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 124 + 1

Reorder the terms:
1 + 2x + x2 = 124 + 1

Combine like terms: 124 + 1 = 125
1 + 2x + x2 = 125

Factor a perfect square on the left side:
(x + 1)(x + 1) = 125

Calculate the square root of the right side: 11.180339887

Break this problem into two subproblems by setting 
(x + 1) equal to 11.180339887 and -11.180339887.

Subproblem 1

x + 1 = 11.180339887 Simplifying x + 1 = 11.180339887 Reorder the terms: 1 + x = 11.180339887 Solving 1 + x = 11.180339887 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 11.180339887 + -1 Combine like terms: 1 + -1 = 0 0 + x = 11.180339887 + -1 x = 11.180339887 + -1 Combine like terms: 11.180339887 + -1 = 10.180339887 x = 10.180339887 Simplifying x = 10.180339887

Subproblem 2

x + 1 = -11.180339887 Simplifying x + 1 = -11.180339887 Reorder the terms: 1 + x = -11.180339887 Solving 1 + x = -11.180339887 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -11.180339887 + -1 Combine like terms: 1 + -1 = 0 0 + x = -11.180339887 + -1 x = -11.180339887 + -1 Combine like terms: -11.180339887 + -1 = -12.180339887 x = -12.180339887 Simplifying x = -12.180339887

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.180339887, -12.180339887}

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