9x^2-24x-57=0

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Solution for 9x^2-24x-57=0 equation: 


Simplifying
9x2 + -24x + -57 = 0

Reorder the terms:
-57 + -24x + 9x2 = 0

Solving
-57 + -24x + 9x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '3'.
3(-19 + -8x + 3x2) = 0

Ignore the factor 3.

Subproblem 1
Set the factor '(-19 + -8x + 3x2)' equal to zero and attempt to solve:

Simplifying
-19 + -8x + 3x2 = 0

Solving
-19 + -8x + 3x2 = 0

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

Divide each side by '3'.
-6.333333333 + -2.666666667x + x2 = 0

Move the constant term to the right:

Add '6.333333333' to each side of the equation.
-6.333333333 + -2.666666667x + 6.333333333 + x2 = 0 + 6.333333333

Reorder the terms:
-6.333333333 + 6.333333333 + -2.666666667x + x2 = 0 + 6.333333333

Combine like terms: -6.333333333 + 6.333333333 = 0.000000000
0.000000000 + -2.666666667x + x2 = 0 + 6.333333333
-2.666666667x + x2 = 0 + 6.333333333

Combine like terms: 0 + 6.333333333 = 6.333333333
-2.666666667x + x2 = 6.333333333

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 = 6.333333333 + 1.777777780

Reorder the terms:
1.777777780 + -2.666666667x + x2 = 6.333333333 + 1.777777780

Combine like terms: 6.333333333 + 1.777777780 = 8.111111113
1.777777780 + -2.666666667x + x2 = 8.111111113

Factor a perfect square on the left side:
(x + -1.333333334)(x + -1.333333334) = 8.111111113

Calculate the square root of the right side: 2.848001249

Break this problem into two subproblems by setting 
(x + -1.333333334) equal to 2.848001249 and -2.848001249.


Subproblem 1
x + -1.333333334 = 2.848001249

Simplifying
x + -1.333333334 = 2.848001249

Reorder the terms:
-1.333333334 + x = 2.848001249

Solving
-1.333333334 + x = 2.848001249

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 = 2.848001249 + 1.333333334

Combine like terms: -1.333333334 + 1.333333334 = 0.000000000
0.000000000 + x = 2.848001249 + 1.333333334
x = 2.848001249 + 1.333333334

Combine like terms: 2.848001249 + 1.333333334 = 4.181334583
x = 4.181334583

Simplifying
x = 4.181334583


Subproblem 2
x + -1.333333334 = -2.848001249

Simplifying
x + -1.333333334 = -2.848001249

Reorder the terms:
-1.333333334 + x = -2.848001249

Solving
-1.333333334 + x = -2.848001249

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 = -2.848001249 + 1.333333334

Combine like terms: -1.333333334 + 1.333333334 = 0.000000000
0.000000000 + x = -2.848001249 + 1.333333334
x = -2.848001249 + 1.333333334

Combine like terms: -2.848001249 + 1.333333334 = -1.514667915
x = -1.514667915

Simplifying
x = -1.514667915


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {4.181334583, -1.514667915}
Solution
x = {4.181334583, -1.514667915}

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