8x^2-40x-5=0

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Solution for 8x^2-40x-5=0 equation: 


Simplifying
8x2 + -40x + -5 = 0

Reorder the terms:
-5 + -40x + 8x2 = 0

Solving
-5 + -40x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
-0.625 + -5x + x2 = 0

Move the constant term to the right:

Add '0.625' to each side of the equation.
-0.625 + -5x + 0.625 + x2 = 0 + 0.625

Reorder the terms:
-0.625 + 0.625 + -5x + x2 = 0 + 0.625

Combine like terms: -0.625 + 0.625 = 0.000
0.000 + -5x + x2 = 0 + 0.625
-5x + x2 = 0 + 0.625

Combine like terms: 0 + 0.625 = 0.625
-5x + x2 = 0.625

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 0.625 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 0.625 + 6.25

Combine like terms: 0.625 + 6.25 = 6.875
6.25 + -5x + x2 = 6.875

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 6.875

Calculate the square root of the right side: 2.62202212

Break this problem into two subproblems by setting 
(x + -2.5) equal to 2.62202212 and -2.62202212.


Subproblem 1
x + -2.5 = 2.62202212

Simplifying
x + -2.5 = 2.62202212

Reorder the terms:
-2.5 + x = 2.62202212

Solving
-2.5 + x = 2.62202212

Solving for variable 'x'.

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

Add '2.5' to each side of the equation.
-2.5 + 2.5 + x = 2.62202212 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + x = 2.62202212 + 2.5
x = 2.62202212 + 2.5

Combine like terms: 2.62202212 + 2.5 = 5.12202212
x = 5.12202212

Simplifying
x = 5.12202212


Subproblem 2
x + -2.5 = -2.62202212

Simplifying
x + -2.5 = -2.62202212

Reorder the terms:
-2.5 + x = -2.62202212

Solving
-2.5 + x = -2.62202212

Solving for variable 'x'.

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

Add '2.5' to each side of the equation.
-2.5 + 2.5 + x = -2.62202212 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + x = -2.62202212 + 2.5
x = -2.62202212 + 2.5

Combine like terms: -2.62202212 + 2.5 = -0.12202212
x = -0.12202212

Simplifying
x = -0.12202212


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {5.12202212, -0.12202212}

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