2x^2+x-1320000=0

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Solution for 2x^2+x-1320000=0 equation:


Simplifying
2x2 + x + -1320000 = 0

Reorder the terms:
-1320000 + x + 2x2 = 0

Solving
-1320000 + x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-660000 + 0.5x + x2 = 0

Move the constant term to the right:

Add '660000' to each side of the equation.
-660000 + 0.5x + 660000 + x2 = 0 + 660000

Reorder the terms:
-660000 + 660000 + 0.5x + x2 = 0 + 660000

Combine like terms: -660000 + 660000 = 0
0 + 0.5x + x2 = 0 + 660000
0.5x + x2 = 0 + 660000

Combine like terms: 0 + 660000 = 660000
0.5x + x2 = 660000

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.
0.5x + 0.25 + x2 = 660000 + 0.25

Reorder the terms:
0.25 + 0.5x + x2 = 660000 + 0.25

Combine like terms: 660000 + 0.25 = 660000.25
0.25 + 0.5x + x2 = 660000.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 660000.25

Calculate the square root of the right side: 812.403994328

Break this problem into two subproblems by setting 
(x + 0.5) equal to 812.403994328 and -812.403994328.

Subproblem 1

x + 0.5 = 812.403994328 Simplifying x + 0.5 = 812.403994328 Reorder the terms: 0.5 + x = 812.403994328 Solving 0.5 + x = 812.403994328 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 = 812.403994328 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 812.403994328 + -0.5 x = 812.403994328 + -0.5 Combine like terms: 812.403994328 + -0.5 = 811.903994328 x = 811.903994328 Simplifying x = 811.903994328

Subproblem 2

x + 0.5 = -812.403994328 Simplifying x + 0.5 = -812.403994328 Reorder the terms: 0.5 + x = -812.403994328 Solving 0.5 + x = -812.403994328 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 = -812.403994328 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -812.403994328 + -0.5 x = -812.403994328 + -0.5 Combine like terms: -812.403994328 + -0.5 = -812.903994328 x = -812.903994328 Simplifying x = -812.903994328

Solution

The solution to the problem is based on the solutions from the subproblems. x = {811.903994328, -812.903994328}

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