8x^2-6x-8=0

Solution for 8x^2-6x-8=0 equation:

Simplifying
8x2 + -6x + -8 = 0

Reorder the terms:
-8 + -6x + 8x2 = 0

Solving
-8 + -6x + 8x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-4 + -3x + 4x2) = 0

Ignore the factor 2.
Subproblem 1
Set the factor '(-4 + -3x + 4x2)' equal to zero and attempt to solve:

Simplifying
-4 + -3x + 4x2 = 0

Solving
-4 + -3x + 4x2 = 0

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

Divide each side by '4'.
-1 + -0.75x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -0.75x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + -0.75x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -0.75x + x2 = 0 + 1
-0.75x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-0.75x + x2 = 1

The x term is -0.75x.  Take half its coefficient (-0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
-0.75x + 0.140625 + x2 = 1 + 0.140625

Reorder the terms:
0.140625 + -0.75x + x2 = 1 + 0.140625

Combine like terms: 1 + 0.140625 = 1.140625
0.140625 + -0.75x + x2 = 1.140625

Factor a perfect square on the left side:
(x + -0.375)(x + -0.375) = 1.140625

Calculate the square root of the right side: 1.068000468

Break this problem into two subproblems by setting 
(x + -0.375) equal to 1.068000468 and -1.068000468.

Subproblem 1
x + -0.375 = 1.068000468

Simplifying
x + -0.375 = 1.068000468

Reorder the terms:
-0.375 + x = 1.068000468

Solving
-0.375 + x = 1.068000468

Solving for variable 'x'.

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

Add '0.375' to each side of the equation.
-0.375 + 0.375 + x = 1.068000468 + 0.375

Combine like terms: -0.375 + 0.375 = 0.000
0.000 + x = 1.068000468 + 0.375
x = 1.068000468 + 0.375

Combine like terms: 1.068000468 + 0.375 = 1.443000468
x = 1.443000468

Simplifying
x = 1.443000468

Subproblem 2
x + -0.375 = -1.068000468

Simplifying
x + -0.375 = -1.068000468

Reorder the terms:
-0.375 + x = -1.068000468

Solving
-0.375 + x = -1.068000468

Solving for variable 'x'.

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

Add '0.375' to each side of the equation.
-0.375 + 0.375 + x = -1.068000468 + 0.375

Combine like terms: -0.375 + 0.375 = 0.000
0.000 + x = -1.068000468 + 0.375
x = -1.068000468 + 0.375

Combine like terms: -1.068000468 + 0.375 = -0.693000468
x = -0.693000468

Simplifying
x = -0.693000468

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {1.443000468, -0.693000468}
Solution
x = {1.443000468, -0.693000468}