2(x^2)+x=8

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Solution for 2(x^2)+x=8 equation: 


Simplifying
2(x2) + x = 8

Reorder the terms:
x + 2x2 = 8

Solving
x + 2x2 = 8

Solving for variable 'x'.

Reorder the terms:
-8 + x + 2x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-8 + x + 2x2 = 0

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

Divide each side by '2'.
-4 + 0.5x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 0.5x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + 0.5x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 0.5x + x2 = 0 + 4
0.5x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
0.5x + x2 = 4

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 = 4 + 0.25

Reorder the terms:
0.25 + 0.5x + x2 = 4 + 0.25

Combine like terms: 4 + 0.25 = 4.25
0.25 + 0.5x + x2 = 4.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 4.25

Calculate the square root of the right side: 2.061552813

Break this problem into two subproblems by setting 
(x + 0.5) equal to 2.061552813 and -2.061552813.


Subproblem 1
x + 0.5 = 2.061552813

Simplifying
x + 0.5 = 2.061552813

Reorder the terms:
0.5 + x = 2.061552813

Solving
0.5 + x = 2.061552813

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 = 2.061552813 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + x = 2.061552813 + -0.5
x = 2.061552813 + -0.5

Combine like terms: 2.061552813 + -0.5 = 1.561552813
x = 1.561552813

Simplifying
x = 1.561552813


Subproblem 2
x + 0.5 = -2.061552813

Simplifying
x + 0.5 = -2.061552813

Reorder the terms:
0.5 + x = -2.061552813

Solving
0.5 + x = -2.061552813

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 = -2.061552813 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + x = -2.061552813 + -0.5
x = -2.061552813 + -0.5

Combine like terms: -2.061552813 + -0.5 = -2.561552813
x = -2.561552813

Simplifying
x = -2.561552813


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {1.561552813, -2.561552813}

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