9x^2-24x-11=0

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Solution for 9x^2-24x-11=0 equation:


Simplifying
9x2 + -24x + -11 = 0

Reorder the terms:
-11 + -24x + 9x2 = 0

Solving
-11 + -24x + 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'.
-1.222222222 + -2.666666667x + x2 = 0

Move the constant term to the right:

Add '1.222222222' to each side of the equation.
-1.222222222 + -2.666666667x + 1.222222222 + x2 = 0 + 1.222222222

Reorder the terms:
-1.222222222 + 1.222222222 + -2.666666667x + x2 = 0 + 1.222222222

Combine like terms: -1.222222222 + 1.222222222 = 0.000000000
0.000000000 + -2.666666667x + x2 = 0 + 1.222222222
-2.666666667x + x2 = 0 + 1.222222222

Combine like terms: 0 + 1.222222222 = 1.222222222
-2.666666667x + x2 = 1.222222222

The x term is -2.666666667x.  Take half its coefficient (-1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
-2.666666667x + 1.777777780 + x2 = 1.222222222 + 1.777777780

Reorder the terms:
1.777777780 + -2.666666667x + x2 = 1.222222222 + 1.777777780

Combine like terms: 1.222222222 + 1.777777780 = 3.000000002
1.777777780 + -2.666666667x + x2 = 3.000000002

Factor a perfect square on the left side:
(x + -1.333333334)(x + -1.333333334) = 3.000000002

Calculate the square root of the right side: 1.732050808

Break this problem into two subproblems by setting 
(x + -1.333333334) equal to 1.732050808 and -1.732050808.

Subproblem 1

x + -1.333333334 = 1.732050808 Simplifying x + -1.333333334 = 1.732050808 Reorder the terms: -1.333333334 + x = 1.732050808 Solving -1.333333334 + x = 1.732050808 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.333333334' to each side of the equation. -1.333333334 + 1.333333334 + x = 1.732050808 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + x = 1.732050808 + 1.333333334 x = 1.732050808 + 1.333333334 Combine like terms: 1.732050808 + 1.333333334 = 3.065384142 x = 3.065384142 Simplifying x = 3.065384142

Subproblem 2

x + -1.333333334 = -1.732050808 Simplifying x + -1.333333334 = -1.732050808 Reorder the terms: -1.333333334 + x = -1.732050808 Solving -1.333333334 + x = -1.732050808 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.333333334' to each side of the equation. -1.333333334 + 1.333333334 + x = -1.732050808 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + x = -1.732050808 + 1.333333334 x = -1.732050808 + 1.333333334 Combine like terms: -1.732050808 + 1.333333334 = -0.398717474 x = -0.398717474 Simplifying x = -0.398717474

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.065384142, -0.398717474}

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