x^2-x=125

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Solution for x^2-x=125 equation:


Simplifying
x2 + -1x = 125

Reorder the terms:
-1x + x2 = 125

Solving
-1x + x2 = 125

Solving for variable 'x'.

Reorder the terms:
-125 + -1x + x2 = 125 + -125

Combine like terms: 125 + -125 = 0
-125 + -1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '125' to each side of the equation.
-125 + -1x + 125 + x2 = 0 + 125

Reorder the terms:
-125 + 125 + -1x + x2 = 0 + 125

Combine like terms: -125 + 125 = 0
0 + -1x + x2 = 0 + 125
-1x + x2 = 0 + 125

Combine like terms: 0 + 125 = 125
-1x + x2 = 125

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 = 125 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 125 + 0.25

Combine like terms: 125 + 0.25 = 125.25
0.25 + -1x + x2 = 125.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 125.25

Calculate the square root of the right side: 11.191514643

Break this problem into two subproblems by setting 
(x + -0.5) equal to 11.191514643 and -11.191514643.

Subproblem 1

x + -0.5 = 11.191514643 Simplifying x + -0.5 = 11.191514643 Reorder the terms: -0.5 + x = 11.191514643 Solving -0.5 + x = 11.191514643 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 = 11.191514643 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 11.191514643 + 0.5 x = 11.191514643 + 0.5 Combine like terms: 11.191514643 + 0.5 = 11.691514643 x = 11.691514643 Simplifying x = 11.691514643

Subproblem 2

x + -0.5 = -11.191514643 Simplifying x + -0.5 = -11.191514643 Reorder the terms: -0.5 + x = -11.191514643 Solving -0.5 + x = -11.191514643 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 = -11.191514643 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -11.191514643 + 0.5 x = -11.191514643 + 0.5 Combine like terms: -11.191514643 + 0.5 = -10.691514643 x = -10.691514643 Simplifying x = -10.691514643

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.691514643, -10.691514643}

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