2x^2-33x-81=0

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Solution for 2x^2-33x-81=0 equation:


Simplifying
2x2 + -33x + -81 = 0

Reorder the terms:
-81 + -33x + 2x2 = 0

Solving
-81 + -33x + 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'.
-40.5 + -16.5x + x2 = 0

Move the constant term to the right:

Add '40.5' to each side of the equation.
-40.5 + -16.5x + 40.5 + x2 = 0 + 40.5

Reorder the terms:
-40.5 + 40.5 + -16.5x + x2 = 0 + 40.5

Combine like terms: -40.5 + 40.5 = 0.0
0.0 + -16.5x + x2 = 0 + 40.5
-16.5x + x2 = 0 + 40.5

Combine like terms: 0 + 40.5 = 40.5
-16.5x + x2 = 40.5

The x term is -16.5x.  Take half its coefficient (-8.25).
Square it (68.0625) and add it to both sides.

Add '68.0625' to each side of the equation.
-16.5x + 68.0625 + x2 = 40.5 + 68.0625

Reorder the terms:
68.0625 + -16.5x + x2 = 40.5 + 68.0625

Combine like terms: 40.5 + 68.0625 = 108.5625
68.0625 + -16.5x + x2 = 108.5625

Factor a perfect square on the left side:
(x + -8.25)(x + -8.25) = 108.5625

Calculate the square root of the right side: 10.419332992

Break this problem into two subproblems by setting 
(x + -8.25) equal to 10.419332992 and -10.419332992.

Subproblem 1

x + -8.25 = 10.419332992 Simplifying x + -8.25 = 10.419332992 Reorder the terms: -8.25 + x = 10.419332992 Solving -8.25 + x = 10.419332992 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.25' to each side of the equation. -8.25 + 8.25 + x = 10.419332992 + 8.25 Combine like terms: -8.25 + 8.25 = 0.00 0.00 + x = 10.419332992 + 8.25 x = 10.419332992 + 8.25 Combine like terms: 10.419332992 + 8.25 = 18.669332992 x = 18.669332992 Simplifying x = 18.669332992

Subproblem 2

x + -8.25 = -10.419332992 Simplifying x + -8.25 = -10.419332992 Reorder the terms: -8.25 + x = -10.419332992 Solving -8.25 + x = -10.419332992 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.25' to each side of the equation. -8.25 + 8.25 + x = -10.419332992 + 8.25 Combine like terms: -8.25 + 8.25 = 0.00 0.00 + x = -10.419332992 + 8.25 x = -10.419332992 + 8.25 Combine like terms: -10.419332992 + 8.25 = -2.169332992 x = -2.169332992 Simplifying x = -2.169332992

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.669332992, -2.169332992}

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