x=6x^2+9x-27

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Solution for x=6x^2+9x-27 equation:


Simplifying
x = 6x2 + 9x + -27

Reorder the terms:
x = -27 + 9x + 6x2

Solving
x = -27 + 9x + 6x2

Solving for variable 'x'.

Reorder the terms:
27 + x + -9x + -6x2 = -27 + 9x + 6x2 + 27 + -9x + -6x2

Combine like terms: x + -9x = -8x
27 + -8x + -6x2 = -27 + 9x + 6x2 + 27 + -9x + -6x2

Reorder the terms:
27 + -8x + -6x2 = -27 + 27 + 9x + -9x + 6x2 + -6x2

Combine like terms: -27 + 27 = 0
27 + -8x + -6x2 = 0 + 9x + -9x + 6x2 + -6x2
27 + -8x + -6x2 = 9x + -9x + 6x2 + -6x2

Combine like terms: 9x + -9x = 0
27 + -8x + -6x2 = 0 + 6x2 + -6x2
27 + -8x + -6x2 = 6x2 + -6x2

Combine like terms: 6x2 + -6x2 = 0
27 + -8x + -6x2 = 0

Begin completing the square.  Divide all terms by
-6 the coefficient of the squared term: 

Divide each side by '-6'.
-4.5 + 1.333333333x + x2 = 0

Move the constant term to the right:

Add '4.5' to each side of the equation.
-4.5 + 1.333333333x + 4.5 + x2 = 0 + 4.5

Reorder the terms:
-4.5 + 4.5 + 1.333333333x + x2 = 0 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + 1.333333333x + x2 = 0 + 4.5
1.333333333x + x2 = 0 + 4.5

Combine like terms: 0 + 4.5 = 4.5
1.333333333x + x2 = 4.5

The x term is 1.333333333x.  Take half its coefficient (0.6666666665).
Square it (0.4444444442) and add it to both sides.

Add '0.4444444442' to each side of the equation.
1.333333333x + 0.4444444442 + x2 = 4.5 + 0.4444444442

Reorder the terms:
0.4444444442 + 1.333333333x + x2 = 4.5 + 0.4444444442

Combine like terms: 4.5 + 0.4444444442 = 4.9444444442
0.4444444442 + 1.333333333x + x2 = 4.9444444442

Factor a perfect square on the left side:
(x + 0.6666666665)(x + 0.6666666665) = 4.9444444442

Calculate the square root of the right side: 2.223610677

Break this problem into two subproblems by setting 
(x + 0.6666666665) equal to 2.223610677 and -2.223610677.

Subproblem 1

x + 0.6666666665 = 2.223610677 Simplifying x + 0.6666666665 = 2.223610677 Reorder the terms: 0.6666666665 + x = 2.223610677 Solving 0.6666666665 + x = 2.223610677 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6666666665' to each side of the equation. 0.6666666665 + -0.6666666665 + x = 2.223610677 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + x = 2.223610677 + -0.6666666665 x = 2.223610677 + -0.6666666665 Combine like terms: 2.223610677 + -0.6666666665 = 1.5569440105 x = 1.5569440105 Simplifying x = 1.5569440105

Subproblem 2

x + 0.6666666665 = -2.223610677 Simplifying x + 0.6666666665 = -2.223610677 Reorder the terms: 0.6666666665 + x = -2.223610677 Solving 0.6666666665 + x = -2.223610677 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6666666665' to each side of the equation. 0.6666666665 + -0.6666666665 + x = -2.223610677 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + x = -2.223610677 + -0.6666666665 x = -2.223610677 + -0.6666666665 Combine like terms: -2.223610677 + -0.6666666665 = -2.8902773435 x = -2.8902773435 Simplifying x = -2.8902773435

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.5569440105, -2.8902773435}

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