x^2-2x-124=0

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Solution for x^2-2x-124=0 equation:


Simplifying
x2 + -2x + -124 = 0

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

Solving
-124 + -2x + x2 = 0

Solving for variable 'x'.

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 = 12.180339887 x = 12.180339887 Simplifying x = 12.180339887

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 = -10.180339887 x = -10.180339887 Simplifying x = -10.180339887

Solution

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

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