2x^2+23x-8.7=0

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Solution for 2x^2+23x-8.7=0 equation: 


Simplifying
2x2 + 23x + -8.7 = 0

Reorder the terms:
-8.7 + 23x + 2x2 = 0

Solving
-8.7 + 23x + 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'.
-4.35 + 11.5x + x2 = 0

Move the constant term to the right:

Add '4.35' to each side of the equation.
-4.35 + 11.5x + 4.35 + x2 = 0 + 4.35

Reorder the terms:
-4.35 + 4.35 + 11.5x + x2 = 0 + 4.35

Combine like terms: -4.35 + 4.35 = 0.00
0.00 + 11.5x + x2 = 0 + 4.35
11.5x + x2 = 0 + 4.35

Combine like terms: 0 + 4.35 = 4.35
11.5x + x2 = 4.35

The x term is 11.5x.  Take half its coefficient (5.75).
Square it (33.0625) and add it to both sides.

Add '33.0625' to each side of the equation.
11.5x + 33.0625 + x2 = 4.35 + 33.0625

Reorder the terms:
33.0625 + 11.5x + x2 = 4.35 + 33.0625

Combine like terms: 4.35 + 33.0625 = 37.4125
33.0625 + 11.5x + x2 = 37.4125

Factor a perfect square on the left side:
(x + 5.75)(x + 5.75) = 37.4125

Calculate the square root of the right side: 6.116575839

Break this problem into two subproblems by setting 
(x + 5.75) equal to 6.116575839 and -6.116575839.


Subproblem 1
x + 5.75 = 6.116575839

Simplifying
x + 5.75 = 6.116575839

Reorder the terms:
5.75 + x = 6.116575839

Solving
5.75 + x = 6.116575839

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-5.75' to each side of the equation.
5.75 + -5.75 + x = 6.116575839 + -5.75

Combine like terms: 5.75 + -5.75 = 0.00
0.00 + x = 6.116575839 + -5.75
x = 6.116575839 + -5.75

Combine like terms: 6.116575839 + -5.75 = 0.366575839
x = 0.366575839

Simplifying
x = 0.366575839


Subproblem 2
x + 5.75 = -6.116575839

Simplifying
x + 5.75 = -6.116575839

Reorder the terms:
5.75 + x = -6.116575839

Solving
5.75 + x = -6.116575839

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-5.75' to each side of the equation.
5.75 + -5.75 + x = -6.116575839 + -5.75

Combine like terms: 5.75 + -5.75 = 0.00
0.00 + x = -6.116575839 + -5.75
x = -6.116575839 + -5.75

Combine like terms: -6.116575839 + -5.75 = -11.866575839
x = -11.866575839

Simplifying
x = -11.866575839


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.366575839, -11.866575839}

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