2x^2-9x-27=0

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Solution for 2x^2-9x-27=0 equation:


Simplifying
2x2 + -9x + -27 = 0

Reorder the terms:
-27 + -9x + 2x2 = 0

Solving
-27 + -9x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-13.5 + -4.5x + x2 = 0

Move the constant term to the right:

Add '13.5' to each side of the equation.
-13.5 + -4.5x + 13.5 + x2 = 0 + 13.5

Reorder the terms:
-13.5 + 13.5 + -4.5x + x2 = 0 + 13.5

Combine like terms: -13.5 + 13.5 = 0.0
0.0 + -4.5x + x2 = 0 + 13.5
-4.5x + x2 = 0 + 13.5

Combine like terms: 0 + 13.5 = 13.5
-4.5x + x2 = 13.5

The x term is -4.5x.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5x + 5.0625 + x2 = 13.5 + 5.0625

Reorder the terms:
5.0625 + -4.5x + x2 = 13.5 + 5.0625

Combine like terms: 13.5 + 5.0625 = 18.5625
5.0625 + -4.5x + x2 = 18.5625

Factor a perfect square on the left side:
(x + -2.25)(x + -2.25) = 18.5625

Calculate the square root of the right side: 4.308421985

Break this problem into two subproblems by setting 
(x + -2.25) equal to 4.308421985 and -4.308421985.

Subproblem 1

x + -2.25 = 4.308421985 Simplifying x + -2.25 = 4.308421985 Reorder the terms: -2.25 + x = 4.308421985 Solving -2.25 + x = 4.308421985 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = 4.308421985 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = 4.308421985 + 2.25 x = 4.308421985 + 2.25 Combine like terms: 4.308421985 + 2.25 = 6.558421985 x = 6.558421985 Simplifying x = 6.558421985

Subproblem 2

x + -2.25 = -4.308421985 Simplifying x + -2.25 = -4.308421985 Reorder the terms: -2.25 + x = -4.308421985 Solving -2.25 + x = -4.308421985 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = -4.308421985 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = -4.308421985 + 2.25 x = -4.308421985 + 2.25 Combine like terms: -4.308421985 + 2.25 = -2.058421985 x = -2.058421985 Simplifying x = -2.058421985

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.558421985, -2.058421985}

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