x^2-x=115

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Solution for x^2-x=115 equation:


Simplifying
x2 + -1x = 115

Reorder the terms:
-1x + x2 = 115

Solving
-1x + x2 = 115

Solving for variable 'x'.

Reorder the terms:
-115 + -1x + x2 = 115 + -115

Combine like terms: 115 + -115 = 0
-115 + -1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '115' to each side of the equation.
-115 + -1x + 115 + x2 = 0 + 115

Reorder the terms:
-115 + 115 + -1x + x2 = 0 + 115

Combine like terms: -115 + 115 = 0
0 + -1x + x2 = 0 + 115
-1x + x2 = 0 + 115

Combine like terms: 0 + 115 = 115
-1x + x2 = 115

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 115 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 115 + 0.25

Combine like terms: 115 + 0.25 = 115.25
0.25 + -1x + x2 = 115.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 115.25

Calculate the square root of the right side: 10.735455277

Break this problem into two subproblems by setting 
(x + -0.5) equal to 10.735455277 and -10.735455277.

Subproblem 1

x + -0.5 = 10.735455277 Simplifying x + -0.5 = 10.735455277 Reorder the terms: -0.5 + x = 10.735455277 Solving -0.5 + x = 10.735455277 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 10.735455277 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 10.735455277 + 0.5 x = 10.735455277 + 0.5 Combine like terms: 10.735455277 + 0.5 = 11.235455277 x = 11.235455277 Simplifying x = 11.235455277

Subproblem 2

x + -0.5 = -10.735455277 Simplifying x + -0.5 = -10.735455277 Reorder the terms: -0.5 + x = -10.735455277 Solving -0.5 + x = -10.735455277 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -10.735455277 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -10.735455277 + 0.5 x = -10.735455277 + 0.5 Combine like terms: -10.735455277 + 0.5 = -10.235455277 x = -10.235455277 Simplifying x = -10.235455277

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.235455277, -10.235455277}

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