2x^2+x-289=0

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Solution for 2x^2+x-289=0 equation:


Simplifying
2x2 + x + -289 = 0

Reorder the terms:
-289 + x + 2x2 = 0

Solving
-289 + 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'.
-144.5 + 0.5x + x2 = 0

Move the constant term to the right:

Add '144.5' to each side of the equation.
-144.5 + 0.5x + 144.5 + x2 = 0 + 144.5

Reorder the terms:
-144.5 + 144.5 + 0.5x + x2 = 0 + 144.5

Combine like terms: -144.5 + 144.5 = 0.0
0.0 + 0.5x + x2 = 0 + 144.5
0.5x + x2 = 0 + 144.5

Combine like terms: 0 + 144.5 = 144.5
0.5x + x2 = 144.5

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.
0.5x + 0.25 + x2 = 144.5 + 0.25

Reorder the terms:
0.25 + 0.5x + x2 = 144.5 + 0.25

Combine like terms: 144.5 + 0.25 = 144.75
0.25 + 0.5x + x2 = 144.75

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 144.75

Calculate the square root of the right side: 12.031209416

Break this problem into two subproblems by setting 
(x + 0.5) equal to 12.031209416 and -12.031209416.

Subproblem 1

x + 0.5 = 12.031209416 Simplifying x + 0.5 = 12.031209416 Reorder the terms: 0.5 + x = 12.031209416 Solving 0.5 + x = 12.031209416 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 = 12.031209416 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 12.031209416 + -0.5 x = 12.031209416 + -0.5 Combine like terms: 12.031209416 + -0.5 = 11.531209416 x = 11.531209416 Simplifying x = 11.531209416

Subproblem 2

x + 0.5 = -12.031209416 Simplifying x + 0.5 = -12.031209416 Reorder the terms: 0.5 + x = -12.031209416 Solving 0.5 + x = -12.031209416 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 = -12.031209416 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -12.031209416 + -0.5 x = -12.031209416 + -0.5 Combine like terms: -12.031209416 + -0.5 = -12.531209416 x = -12.531209416 Simplifying x = -12.531209416

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.531209416, -12.531209416}

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