0=2x^2-24x-81

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Solution for 0=2x^2-24x-81 equation:


Simplifying
0 = 2x2 + -24x + -81

Reorder the terms:
0 = -81 + -24x + 2x2

Solving
0 = -81 + -24x + 2x2

Solving for variable 'x'.

Combine like terms: 0 + 81 = 81
81 + 24x + -2x2 = -81 + -24x + 2x2 + 81 + 24x + -2x2

Reorder the terms:
81 + 24x + -2x2 = -81 + 81 + -24x + 24x + 2x2 + -2x2

Combine like terms: -81 + 81 = 0
81 + 24x + -2x2 = 0 + -24x + 24x + 2x2 + -2x2
81 + 24x + -2x2 = -24x + 24x + 2x2 + -2x2

Combine like terms: -24x + 24x = 0
81 + 24x + -2x2 = 0 + 2x2 + -2x2
81 + 24x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
81 + 24x + -2x2 = 0

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

Divide each side by '-2'.
-40.5 + -12x + x2 = 0

Move the constant term to the right:

Add '40.5' to each side of the equation.
-40.5 + -12x + 40.5 + x2 = 0 + 40.5

Reorder the terms:
-40.5 + 40.5 + -12x + x2 = 0 + 40.5

Combine like terms: -40.5 + 40.5 = 0.0
0.0 + -12x + x2 = 0 + 40.5
-12x + x2 = 0 + 40.5

Combine like terms: 0 + 40.5 = 40.5
-12x + x2 = 40.5

The x term is -12x.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12x + 36 + x2 = 40.5 + 36

Reorder the terms:
36 + -12x + x2 = 40.5 + 36

Combine like terms: 40.5 + 36 = 76.5
36 + -12x + x2 = 76.5

Factor a perfect square on the left side:
(x + -6)(x + -6) = 76.5

Calculate the square root of the right side: 8.746427842

Break this problem into two subproblems by setting 
(x + -6) equal to 8.746427842 and -8.746427842.

Subproblem 1

x + -6 = 8.746427842 Simplifying x + -6 = 8.746427842 Reorder the terms: -6 + x = 8.746427842 Solving -6 + x = 8.746427842 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = 8.746427842 + 6 Combine like terms: -6 + 6 = 0 0 + x = 8.746427842 + 6 x = 8.746427842 + 6 Combine like terms: 8.746427842 + 6 = 14.746427842 x = 14.746427842 Simplifying x = 14.746427842

Subproblem 2

x + -6 = -8.746427842 Simplifying x + -6 = -8.746427842 Reorder the terms: -6 + x = -8.746427842 Solving -6 + x = -8.746427842 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = -8.746427842 + 6 Combine like terms: -6 + 6 = 0 0 + x = -8.746427842 + 6 x = -8.746427842 + 6 Combine like terms: -8.746427842 + 6 = -2.746427842 x = -2.746427842 Simplifying x = -2.746427842

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.746427842, -2.746427842}

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