2x^2-39x-120=0

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Solution for 2x^2-39x-120=0 equation:


Simplifying
2x2 + -39x + -120 = 0

Reorder the terms:
-120 + -39x + 2x2 = 0

Solving
-120 + -39x + 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'.
-60 + -19.5x + x2 = 0

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + -19.5x + 60 + x2 = 0 + 60

Reorder the terms:
-60 + 60 + -19.5x + x2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + -19.5x + x2 = 0 + 60
-19.5x + x2 = 0 + 60

Combine like terms: 0 + 60 = 60
-19.5x + x2 = 60

The x term is -19.5x.  Take half its coefficient (-9.75).
Square it (95.0625) and add it to both sides.

Add '95.0625' to each side of the equation.
-19.5x + 95.0625 + x2 = 60 + 95.0625

Reorder the terms:
95.0625 + -19.5x + x2 = 60 + 95.0625

Combine like terms: 60 + 95.0625 = 155.0625
95.0625 + -19.5x + x2 = 155.0625

Factor a perfect square on the left side:
(x + -9.75)(x + -9.75) = 155.0625

Calculate the square root of the right side: 12.452409405

Break this problem into two subproblems by setting 
(x + -9.75) equal to 12.452409405 and -12.452409405.

Subproblem 1

x + -9.75 = 12.452409405 Simplifying x + -9.75 = 12.452409405 Reorder the terms: -9.75 + x = 12.452409405 Solving -9.75 + x = 12.452409405 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9.75' to each side of the equation. -9.75 + 9.75 + x = 12.452409405 + 9.75 Combine like terms: -9.75 + 9.75 = 0.00 0.00 + x = 12.452409405 + 9.75 x = 12.452409405 + 9.75 Combine like terms: 12.452409405 + 9.75 = 22.202409405 x = 22.202409405 Simplifying x = 22.202409405

Subproblem 2

x + -9.75 = -12.452409405 Simplifying x + -9.75 = -12.452409405 Reorder the terms: -9.75 + x = -12.452409405 Solving -9.75 + x = -12.452409405 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9.75' to each side of the equation. -9.75 + 9.75 + x = -12.452409405 + 9.75 Combine like terms: -9.75 + 9.75 = 0.00 0.00 + x = -12.452409405 + 9.75 x = -12.452409405 + 9.75 Combine like terms: -12.452409405 + 9.75 = -2.702409405 x = -2.702409405 Simplifying x = -2.702409405

Solution

The solution to the problem is based on the solutions from the subproblems. x = {22.202409405, -2.702409405}

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