8x^2-23x-6=0

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Solution for 8x^2-23x-6=0 equation:


Simplifying
8x2 + -23x + -6 = 0

Reorder the terms:
-6 + -23x + 8x2 = 0

Solving
-6 + -23x + 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'.
-0.75 + -2.875x + x2 = 0

Move the constant term to the right:

Add '0.75' to each side of the equation.
-0.75 + -2.875x + 0.75 + x2 = 0 + 0.75

Reorder the terms:
-0.75 + 0.75 + -2.875x + x2 = 0 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + -2.875x + x2 = 0 + 0.75
-2.875x + x2 = 0 + 0.75

Combine like terms: 0 + 0.75 = 0.75
-2.875x + x2 = 0.75

The x term is -2.875x.  Take half its coefficient (-1.4375).
Square it (2.06640625) and add it to both sides.

Add '2.06640625' to each side of the equation.
-2.875x + 2.06640625 + x2 = 0.75 + 2.06640625

Reorder the terms:
2.06640625 + -2.875x + x2 = 0.75 + 2.06640625

Combine like terms: 0.75 + 2.06640625 = 2.81640625
2.06640625 + -2.875x + x2 = 2.81640625

Factor a perfect square on the left side:
(x + -1.4375)(x + -1.4375) = 2.81640625

Calculate the square root of the right side: 1.678215198

Break this problem into two subproblems by setting 
(x + -1.4375) equal to 1.678215198 and -1.678215198.

Subproblem 1

x + -1.4375 = 1.678215198 Simplifying x + -1.4375 = 1.678215198 Reorder the terms: -1.4375 + x = 1.678215198 Solving -1.4375 + x = 1.678215198 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.4375' to each side of the equation. -1.4375 + 1.4375 + x = 1.678215198 + 1.4375 Combine like terms: -1.4375 + 1.4375 = 0.0000 0.0000 + x = 1.678215198 + 1.4375 x = 1.678215198 + 1.4375 Combine like terms: 1.678215198 + 1.4375 = 3.115715198 x = 3.115715198 Simplifying x = 3.115715198

Subproblem 2

x + -1.4375 = -1.678215198 Simplifying x + -1.4375 = -1.678215198 Reorder the terms: -1.4375 + x = -1.678215198 Solving -1.4375 + x = -1.678215198 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.4375' to each side of the equation. -1.4375 + 1.4375 + x = -1.678215198 + 1.4375 Combine like terms: -1.4375 + 1.4375 = 0.0000 0.0000 + x = -1.678215198 + 1.4375 x = -1.678215198 + 1.4375 Combine like terms: -1.678215198 + 1.4375 = -0.240715198 x = -0.240715198 Simplifying x = -0.240715198

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.115715198, -0.240715198}

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