x^2-2x-156=0

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Solution for x^2-2x-156=0 equation:


Simplifying
x2 + -2x + -156 = 0

Reorder the terms:
-156 + -2x + x2 = 0

Solving
-156 + -2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '156' to each side of the equation.
-156 + -2x + 156 + x2 = 0 + 156

Reorder the terms:
-156 + 156 + -2x + x2 = 0 + 156

Combine like terms: -156 + 156 = 0
0 + -2x + x2 = 0 + 156
-2x + x2 = 0 + 156

Combine like terms: 0 + 156 = 156
-2x + x2 = 156

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 = 156 + 1

Reorder the terms:
1 + -2x + x2 = 156 + 1

Combine like terms: 156 + 1 = 157
1 + -2x + x2 = 157

Factor a perfect square on the left side:
(x + -1)(x + -1) = 157

Calculate the square root of the right side: 12.529964086

Break this problem into two subproblems by setting 
(x + -1) equal to 12.529964086 and -12.529964086.

Subproblem 1

x + -1 = 12.529964086 Simplifying x + -1 = 12.529964086 Reorder the terms: -1 + x = 12.529964086 Solving -1 + x = 12.529964086 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 = 12.529964086 + 1 Combine like terms: -1 + 1 = 0 0 + x = 12.529964086 + 1 x = 12.529964086 + 1 Combine like terms: 12.529964086 + 1 = 13.529964086 x = 13.529964086 Simplifying x = 13.529964086

Subproblem 2

x + -1 = -12.529964086 Simplifying x + -1 = -12.529964086 Reorder the terms: -1 + x = -12.529964086 Solving -1 + x = -12.529964086 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 = -12.529964086 + 1 Combine like terms: -1 + 1 = 0 0 + x = -12.529964086 + 1 x = -12.529964086 + 1 Combine like terms: -12.529964086 + 1 = -11.529964086 x = -11.529964086 Simplifying x = -11.529964086

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.529964086, -11.529964086}

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