(2*x^2)-12*x-39=0

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Solution for (2*x^2)-12*x-39=0 equation:


Simplifying
(2x2) + -12x + -39 = 0

Reorder the terms:
-39 + -12x + (2x2) = 0

Solving
-39 + -12x + (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'.
-19.5 + -6x + x2 = 0

Move the constant term to the right:

Add '19.5' to each side of the equation.
-19.5 + -6x + 19.5 + x2 = 0 + 19.5

Reorder the terms:
-19.5 + 19.5 + -6x + x2 = 0 + 19.5

Combine like terms: -19.5 + 19.5 = 0.0
0.0 + -6x + x2 = 0 + 19.5
-6x + x2 = 0 + 19.5

Combine like terms: 0 + 19.5 = 19.5
-6x + x2 = 19.5

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 19.5 + 9

Reorder the terms:
9 + -6x + x2 = 19.5 + 9

Combine like terms: 19.5 + 9 = 28.5
9 + -6x + x2 = 28.5

Factor a perfect square on the left side:
((x) + -3)((x) + -3) = 28.5

Calculate the square root of the right side: 5.338539126

Break this problem into two subproblems by setting 
((x) + -3) equal to 5.338539126 and -5.338539126.

Subproblem 1

(x) + -3 = 5.338539126 Simplifying (x) + -3 = 5.338539126 x + -3 = 5.338539126 Reorder the terms: -3 + x = 5.338539126 Solving -3 + x = 5.338539126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 5.338539126 + 3 Combine like terms: -3 + 3 = 0 0 + x = 5.338539126 + 3 x = 5.338539126 + 3 Combine like terms: 5.338539126 + 3 = 8.338539126 x = 8.338539126 Simplifying x = 8.338539126

Subproblem 2

(x) + -3 = -5.338539126 Simplifying (x) + -3 = -5.338539126 x + -3 = -5.338539126 Reorder the terms: -3 + x = -5.338539126 Solving -3 + x = -5.338539126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -5.338539126 + 3 Combine like terms: -3 + 3 = 0 0 + x = -5.338539126 + 3 x = -5.338539126 + 3 Combine like terms: -5.338539126 + 3 = -2.338539126 x = -2.338539126 Simplifying x = -2.338539126

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.338539126, -2.338539126}

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