3x^2-9x-36=0

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Solution for 3x^2-9x-36=0 equation: 


Simplifying
3x2 + -9x + -36 = 0

Reorder the terms:
-36 + -9x + 3x2 = 0

Solving
-36 + -9x + 3x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '3'.
3(-12 + -3x + x2) = 0

Ignore the factor 3.

Subproblem 1
Set the factor '(-12 + -3x + x2)' equal to zero and attempt to solve:

Simplifying
-12 + -3x + x2 = 0

Solving
-12 + -3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -3x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + -3x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -3x + x2 = 0 + 12
-3x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
-3x + x2 = 12

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 12 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 12 + 2.25

Combine like terms: 12 + 2.25 = 14.25
2.25 + -3x + x2 = 14.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 14.25

Calculate the square root of the right side: 3.774917218

Break this problem into two subproblems by setting 
(x + -1.5) equal to 3.774917218 and -3.774917218.


Subproblem 1
x + -1.5 = 3.774917218

Simplifying
x + -1.5 = 3.774917218

Reorder the terms:
-1.5 + x = 3.774917218

Solving
-1.5 + x = 3.774917218

Solving for variable 'x'.

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

Add '1.5' to each side of the equation.
-1.5 + 1.5 + x = 3.774917218 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + x = 3.774917218 + 1.5
x = 3.774917218 + 1.5

Combine like terms: 3.774917218 + 1.5 = 5.274917218
x = 5.274917218

Simplifying
x = 5.274917218


Subproblem 2
x + -1.5 = -3.774917218

Simplifying
x + -1.5 = -3.774917218

Reorder the terms:
-1.5 + x = -3.774917218

Solving
-1.5 + x = -3.774917218

Solving for variable 'x'.

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

Add '1.5' to each side of the equation.
-1.5 + 1.5 + x = -3.774917218 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + x = -3.774917218 + 1.5
x = -3.774917218 + 1.5

Combine like terms: -3.774917218 + 1.5 = -2.274917218
x = -2.274917218

Simplifying
x = -2.274917218


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {5.274917218, -2.274917218}
Solution
x = {5.274917218, -2.274917218}

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