-3x^2-18x-26=0

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Solution for -3x^2-18x-26=0 equation: 


Simplifying
-3x2 + -18x + -26 = 0

Reorder the terms:
-26 + -18x + -3x2 = 0

Solving
-26 + -18x + -3x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '-1'.
-1(26 + 18x + 3x2) = 0

Ignore the factor -1.

Subproblem 1
Set the factor '(26 + 18x + 3x2)' equal to zero and attempt to solve:

Simplifying
26 + 18x + 3x2 = 0

Solving
26 + 18x + 3x2 = 0

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

Divide each side by '3'.
8.666666667 + 6x + x2 = 0

Move the constant term to the right:

Add '-8.666666667' to each side of the equation.
8.666666667 + 6x + -8.666666667 + x2 = 0 + -8.666666667

Reorder the terms:
8.666666667 + -8.666666667 + 6x + x2 = 0 + -8.666666667

Combine like terms: 8.666666667 + -8.666666667 = 0.000000000
0.000000000 + 6x + x2 = 0 + -8.666666667
6x + x2 = 0 + -8.666666667

Combine like terms: 0 + -8.666666667 = -8.666666667
6x + x2 = -8.666666667

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = -8.666666667 + 9

Reorder the terms:
9 + 6x + x2 = -8.666666667 + 9

Combine like terms: -8.666666667 + 9 = 0.333333333
9 + 6x + x2 = 0.333333333

Factor a perfect square on the left side:
(x + 3)(x + 3) = 0.333333333

Calculate the square root of the right side: 0.577350269

Break this problem into two subproblems by setting 
(x + 3) equal to 0.577350269 and -0.577350269.


Subproblem 1
x + 3 = 0.577350269

Simplifying
x + 3 = 0.577350269

Reorder the terms:
3 + x = 0.577350269

Solving
3 + x = 0.577350269

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-3' to each side of the equation.
3 + -3 + x = 0.577350269 + -3

Combine like terms: 3 + -3 = 0
0 + x = 0.577350269 + -3
x = 0.577350269 + -3

Combine like terms: 0.577350269 + -3 = -2.422649731
x = -2.422649731

Simplifying
x = -2.422649731


Subproblem 2
x + 3 = -0.577350269

Simplifying
x + 3 = -0.577350269

Reorder the terms:
3 + x = -0.577350269

Solving
3 + x = -0.577350269

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-3' to each side of the equation.
3 + -3 + x = -0.577350269 + -3

Combine like terms: 3 + -3 = 0
0 + x = -0.577350269 + -3
x = -0.577350269 + -3

Combine like terms: -0.577350269 + -3 = -3.577350269
x = -3.577350269

Simplifying
x = -3.577350269


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {-2.422649731, -3.577350269}
Solution
x = {-2.422649731, -3.577350269}

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