x^2-x-20100=0

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Solution for x^2-x-20100=0 equation:


Simplifying
x2 + -1x + -20100 = 0

Reorder the terms:
-20100 + -1x + x2 = 0

Solving
-20100 + -1x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '20100' to each side of the equation.
-20100 + -1x + 20100 + x2 = 0 + 20100

Reorder the terms:
-20100 + 20100 + -1x + x2 = 0 + 20100

Combine like terms: -20100 + 20100 = 0
0 + -1x + x2 = 0 + 20100
-1x + x2 = 0 + 20100

Combine like terms: 0 + 20100 = 20100
-1x + x2 = 20100

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 = 20100 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 20100 + 0.25

Combine like terms: 20100 + 0.25 = 20100.25
0.25 + -1x + x2 = 20100.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 20100.25

Calculate the square root of the right side: 141.775350467

Break this problem into two subproblems by setting 
(x + -0.5) equal to 141.775350467 and -141.775350467.

Subproblem 1

x + -0.5 = 141.775350467 Simplifying x + -0.5 = 141.775350467 Reorder the terms: -0.5 + x = 141.775350467 Solving -0.5 + x = 141.775350467 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 = 141.775350467 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 141.775350467 + 0.5 x = 141.775350467 + 0.5 Combine like terms: 141.775350467 + 0.5 = 142.275350467 x = 142.275350467 Simplifying x = 142.275350467

Subproblem 2

x + -0.5 = -141.775350467 Simplifying x + -0.5 = -141.775350467 Reorder the terms: -0.5 + x = -141.775350467 Solving -0.5 + x = -141.775350467 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 = -141.775350467 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -141.775350467 + 0.5 x = -141.775350467 + 0.5 Combine like terms: -141.775350467 + 0.5 = -141.275350467 x = -141.275350467 Simplifying x = -141.275350467

Solution

The solution to the problem is based on the solutions from the subproblems. x = {142.275350467, -141.275350467}

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