x^2+x-8100=0

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Solution for x^2+x-8100=0 equation:


Simplifying
x2 + x + -8100 = 0

Reorder the terms:
-8100 + x + x2 = 0

Solving
-8100 + x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '8100' to each side of the equation.
-8100 + x + 8100 + x2 = 0 + 8100

Reorder the terms:
-8100 + 8100 + x + x2 = 0 + 8100

Combine like terms: -8100 + 8100 = 0
0 + x + x2 = 0 + 8100
x + x2 = 0 + 8100

Combine like terms: 0 + 8100 = 8100
x + x2 = 8100

The x term is x.  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.
x + 0.25 + x2 = 8100 + 0.25

Reorder the terms:
0.25 + x + x2 = 8100 + 0.25

Combine like terms: 8100 + 0.25 = 8100.25
0.25 + x + x2 = 8100.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 8100.25

Calculate the square root of the right side: 90.001388878

Break this problem into two subproblems by setting 
(x + 0.5) equal to 90.001388878 and -90.001388878.

Subproblem 1

x + 0.5 = 90.001388878 Simplifying x + 0.5 = 90.001388878 Reorder the terms: 0.5 + x = 90.001388878 Solving 0.5 + x = 90.001388878 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 = 90.001388878 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 90.001388878 + -0.5 x = 90.001388878 + -0.5 Combine like terms: 90.001388878 + -0.5 = 89.501388878 x = 89.501388878 Simplifying x = 89.501388878

Subproblem 2

x + 0.5 = -90.001388878 Simplifying x + 0.5 = -90.001388878 Reorder the terms: 0.5 + x = -90.001388878 Solving 0.5 + x = -90.001388878 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 = -90.001388878 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -90.001388878 + -0.5 x = -90.001388878 + -0.5 Combine like terms: -90.001388878 + -0.5 = -90.501388878 x = -90.501388878 Simplifying x = -90.501388878

Solution

The solution to the problem is based on the solutions from the subproblems. x = {89.501388878, -90.501388878}

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