2x^2-3x-120=0

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Solution for 2x^2-3x-120=0 equation:


Simplifying
2x2 + -3x + -120 = 0

Reorder the terms:
-120 + -3x + 2x2 = 0

Solving
-120 + -3x + 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 + -1.5x + x2 = 0

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + -1.5x + 60 + x2 = 0 + 60

Reorder the terms:
-60 + 60 + -1.5x + x2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + -1.5x + x2 = 0 + 60
-1.5x + x2 = 0 + 60

Combine like terms: 0 + 60 = 60
-1.5x + x2 = 60

The x term is -1.5x.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5x + 0.5625 + x2 = 60 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 60 + 0.5625

Combine like terms: 60 + 0.5625 = 60.5625
0.5625 + -1.5x + x2 = 60.5625

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 60.5625

Calculate the square root of the right side: 7.782191208

Break this problem into two subproblems by setting 
(x + -0.75) equal to 7.782191208 and -7.782191208.

Subproblem 1

x + -0.75 = 7.782191208 Simplifying x + -0.75 = 7.782191208 Reorder the terms: -0.75 + x = 7.782191208 Solving -0.75 + x = 7.782191208 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = 7.782191208 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 7.782191208 + 0.75 x = 7.782191208 + 0.75 Combine like terms: 7.782191208 + 0.75 = 8.532191208 x = 8.532191208 Simplifying x = 8.532191208

Subproblem 2

x + -0.75 = -7.782191208 Simplifying x + -0.75 = -7.782191208 Reorder the terms: -0.75 + x = -7.782191208 Solving -0.75 + x = -7.782191208 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = -7.782191208 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -7.782191208 + 0.75 x = -7.782191208 + 0.75 Combine like terms: -7.782191208 + 0.75 = -7.032191208 x = -7.032191208 Simplifying x = -7.032191208

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.532191208, -7.032191208}

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