9x^2-11x-8=0

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Solution for 9x^2-11x-8=0 equation:


Simplifying
9x2 + -11x + -8 = 0

Reorder the terms:
-8 + -11x + 9x2 = 0

Solving
-8 + -11x + 9x2 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
-0.8888888889 + -1.222222222x + x2 = 0

Move the constant term to the right:

Add '0.8888888889' to each side of the equation.
-0.8888888889 + -1.222222222x + 0.8888888889 + x2 = 0 + 0.8888888889

Reorder the terms:
-0.8888888889 + 0.8888888889 + -1.222222222x + x2 = 0 + 0.8888888889

Combine like terms: -0.8888888889 + 0.8888888889 = 0.0000000000
0.0000000000 + -1.222222222x + x2 = 0 + 0.8888888889
-1.222222222x + x2 = 0 + 0.8888888889

Combine like terms: 0 + 0.8888888889 = 0.8888888889
-1.222222222x + x2 = 0.8888888889

The x term is -1.222222222x.  Take half its coefficient (-0.611111111).
Square it (0.3734567900) and add it to both sides.

Add '0.3734567900' to each side of the equation.
-1.222222222x + 0.3734567900 + x2 = 0.8888888889 + 0.3734567900

Reorder the terms:
0.3734567900 + -1.222222222x + x2 = 0.8888888889 + 0.3734567900

Combine like terms: 0.8888888889 + 0.3734567900 = 1.2623456789
0.3734567900 + -1.222222222x + x2 = 1.2623456789

Factor a perfect square on the left side:
(x + -0.611111111)(x + -0.611111111) = 1.2623456789

Calculate the square root of the right side: 1.123541579

Break this problem into two subproblems by setting 
(x + -0.611111111) equal to 1.123541579 and -1.123541579.

Subproblem 1

x + -0.611111111 = 1.123541579 Simplifying x + -0.611111111 = 1.123541579 Reorder the terms: -0.611111111 + x = 1.123541579 Solving -0.611111111 + x = 1.123541579 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.611111111' to each side of the equation. -0.611111111 + 0.611111111 + x = 1.123541579 + 0.611111111 Combine like terms: -0.611111111 + 0.611111111 = 0.000000000 0.000000000 + x = 1.123541579 + 0.611111111 x = 1.123541579 + 0.611111111 Combine like terms: 1.123541579 + 0.611111111 = 1.73465269 x = 1.73465269 Simplifying x = 1.73465269

Subproblem 2

x + -0.611111111 = -1.123541579 Simplifying x + -0.611111111 = -1.123541579 Reorder the terms: -0.611111111 + x = -1.123541579 Solving -0.611111111 + x = -1.123541579 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.611111111' to each side of the equation. -0.611111111 + 0.611111111 + x = -1.123541579 + 0.611111111 Combine like terms: -0.611111111 + 0.611111111 = 0.000000000 0.000000000 + x = -1.123541579 + 0.611111111 x = -1.123541579 + 0.611111111 Combine like terms: -1.123541579 + 0.611111111 = -0.512430468 x = -0.512430468 Simplifying x = -0.512430468

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.73465269, -0.512430468}

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