2x^2+2x-419=0

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Solution for 2x^2+2x-419=0 equation:


Simplifying
2x2 + 2x + -419 = 0

Reorder the terms:
-419 + 2x + 2x2 = 0

Solving
-419 + 2x + 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'.
-209.5 + x + x2 = 0

Move the constant term to the right:

Add '209.5' to each side of the equation.
-209.5 + x + 209.5 + x2 = 0 + 209.5

Reorder the terms:
-209.5 + 209.5 + x + x2 = 0 + 209.5

Combine like terms: -209.5 + 209.5 = 0.0
0.0 + x + x2 = 0 + 209.5
x + x2 = 0 + 209.5

Combine like terms: 0 + 209.5 = 209.5
x + x2 = 209.5

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 = 209.5 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 209.5 + 0.25

Combine like terms: 209.5 + 0.25 = 209.75
1.25 + x2 = 209.75

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 209.75

Calculate the square root of the right side: 14.482748358

Break this problem into two subproblems by setting 
(x + 0.5) equal to 14.482748358 and -14.482748358.

Subproblem 1

x + 0.5 = 14.482748358 Simplifying x + 0.5 = 14.482748358 Reorder the terms: 0.5 + x = 14.482748358 Solving 0.5 + x = 14.482748358 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 = 14.482748358 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 14.482748358 + -0.5 x = 14.482748358 + -0.5 Combine like terms: 14.482748358 + -0.5 = 13.982748358 x = 13.982748358 Simplifying x = 13.982748358

Subproblem 2

x + 0.5 = -14.482748358 Simplifying x + 0.5 = -14.482748358 Reorder the terms: 0.5 + x = -14.482748358 Solving 0.5 + x = -14.482748358 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 = -14.482748358 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -14.482748358 + -0.5 x = -14.482748358 + -0.5 Combine like terms: -14.482748358 + -0.5 = -14.982748358 x = -14.982748358 Simplifying x = -14.982748358

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.982748358, -14.982748358}

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