0=x^2+x-1000000

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Solution for 0=x^2+x-1000000 equation:


Simplifying
0 = x2 + x + -1000000

Reorder the terms:
0 = -1000000 + x + x2

Solving
0 = -1000000 + x + x2

Solving for variable 'x'.

Combine like terms: 0 + 1000000 = 1000000
1000000 + -1x + -1x2 = -1000000 + x + x2 + 1000000 + -1x + -1x2

Reorder the terms:
1000000 + -1x + -1x2 = -1000000 + 1000000 + x + -1x + x2 + -1x2

Combine like terms: -1000000 + 1000000 = 0
1000000 + -1x + -1x2 = 0 + x + -1x + x2 + -1x2
1000000 + -1x + -1x2 = x + -1x + x2 + -1x2

Combine like terms: x + -1x = 0
1000000 + -1x + -1x2 = 0 + x2 + -1x2
1000000 + -1x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
1000000 + -1x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-1000000 + x + x2 = 0

Move the constant term to the right:

Add '1000000' to each side of the equation.
-1000000 + x + 1000000 + x2 = 0 + 1000000

Reorder the terms:
-1000000 + 1000000 + x + x2 = 0 + 1000000

Combine like terms: -1000000 + 1000000 = 0
0 + x + x2 = 0 + 1000000
x + x2 = 0 + 1000000

Combine like terms: 0 + 1000000 = 1000000
x + x2 = 1000000

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.
 + 0.25 + x2 = 1000000 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 1000000 + 0.25

Combine like terms: 1000000 + 0.25 = 1000000.25
1.25 + x2 = 1000000.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 1000000.25

Calculate the square root of the right side: 1000.000125

Break this problem into two subproblems by setting 
(x + 0.5) equal to 1000.000125 and -1000.000125.

Subproblem 1

x + 0.5 = 1000.000125 Simplifying x + 0.5 = 1000.000125 Reorder the terms: 0.5 + x = 1000.000125 Solving 0.5 + x = 1000.000125 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 = 1000.000125 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 1000.000125 + -0.5 x = 1000.000125 + -0.5 Combine like terms: 1000.000125 + -0.5 = 999.500125 x = 999.500125 Simplifying x = 999.500125

Subproblem 2

x + 0.5 = -1000.000125 Simplifying x + 0.5 = -1000.000125 Reorder the terms: 0.5 + x = -1000.000125 Solving 0.5 + x = -1000.000125 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 = -1000.000125 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -1000.000125 + -0.5 x = -1000.000125 + -0.5 Combine like terms: -1000.000125 + -0.5 = -1000.500125 x = -1000.500125 Simplifying x = -1000.500125

Solution

The solution to the problem is based on the solutions from the subproblems. x = {999.500125, -1000.500125}

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