8x^2-11x-6=0

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Solution for 8x^2-11x-6=0 equation:


Simplifying
8x2 + -11x + -6 = 0

Reorder the terms:
-6 + -11x + 8x2 = 0

Solving
-6 + -11x + 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 + -1.375x + x2 = 0

Move the constant term to the right:

Add '0.75' to each side of the equation.
-0.75 + -1.375x + 0.75 + x2 = 0 + 0.75

Reorder the terms:
-0.75 + 0.75 + -1.375x + x2 = 0 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + -1.375x + x2 = 0 + 0.75
-1.375x + x2 = 0 + 0.75

Combine like terms: 0 + 0.75 = 0.75
-1.375x + x2 = 0.75

The x term is -1.375x.  Take half its coefficient (-0.6875).
Square it (0.47265625) and add it to both sides.

Add '0.47265625' to each side of the equation.
-1.375x + 0.47265625 + x2 = 0.75 + 0.47265625

Reorder the terms:
0.47265625 + -1.375x + x2 = 0.75 + 0.47265625

Combine like terms: 0.75 + 0.47265625 = 1.22265625
0.47265625 + -1.375x + x2 = 1.22265625

Factor a perfect square on the left side:
(x + -0.6875)(x + -0.6875) = 1.22265625

Calculate the square root of the right side: 1.105737876

Break this problem into two subproblems by setting 
(x + -0.6875) equal to 1.105737876 and -1.105737876.

Subproblem 1

x + -0.6875 = 1.105737876 Simplifying x + -0.6875 = 1.105737876 Reorder the terms: -0.6875 + x = 1.105737876 Solving -0.6875 + x = 1.105737876 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6875' to each side of the equation. -0.6875 + 0.6875 + x = 1.105737876 + 0.6875 Combine like terms: -0.6875 + 0.6875 = 0.0000 0.0000 + x = 1.105737876 + 0.6875 x = 1.105737876 + 0.6875 Combine like terms: 1.105737876 + 0.6875 = 1.793237876 x = 1.793237876 Simplifying x = 1.793237876

Subproblem 2

x + -0.6875 = -1.105737876 Simplifying x + -0.6875 = -1.105737876 Reorder the terms: -0.6875 + x = -1.105737876 Solving -0.6875 + x = -1.105737876 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6875' to each side of the equation. -0.6875 + 0.6875 + x = -1.105737876 + 0.6875 Combine like terms: -0.6875 + 0.6875 = 0.0000 0.0000 + x = -1.105737876 + 0.6875 x = -1.105737876 + 0.6875 Combine like terms: -1.105737876 + 0.6875 = -0.418237876 x = -0.418237876 Simplifying x = -0.418237876

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.793237876, -0.418237876}

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