2x^2+5x-120=0

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Solution for 2x^2+5x-120=0 equation:


Simplifying
2x2 + 5x + -120 = 0

Reorder the terms:
-120 + 5x + 2x2 = 0

Solving
-120 + 5x + 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 + 2.5x + x2 = 0

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + 2.5x + 60 + x2 = 0 + 60

Reorder the terms:
-60 + 60 + 2.5x + x2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + 2.5x + x2 = 0 + 60
2.5x + x2 = 0 + 60

Combine like terms: 0 + 60 = 60
2.5x + x2 = 60

The x term is 2.5x.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5x + 1.5625 + x2 = 60 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 60 + 1.5625

Combine like terms: 60 + 1.5625 = 61.5625
1.5625 + 2.5x + x2 = 61.5625

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 61.5625

Calculate the square root of the right side: 7.846177413

Break this problem into two subproblems by setting 
(x + 1.25) equal to 7.846177413 and -7.846177413.

Subproblem 1

x + 1.25 = 7.846177413 Simplifying x + 1.25 = 7.846177413 Reorder the terms: 1.25 + x = 7.846177413 Solving 1.25 + x = 7.846177413 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 7.846177413 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 7.846177413 + -1.25 x = 7.846177413 + -1.25 Combine like terms: 7.846177413 + -1.25 = 6.596177413 x = 6.596177413 Simplifying x = 6.596177413

Subproblem 2

x + 1.25 = -7.846177413 Simplifying x + 1.25 = -7.846177413 Reorder the terms: 1.25 + x = -7.846177413 Solving 1.25 + x = -7.846177413 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -7.846177413 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -7.846177413 + -1.25 x = -7.846177413 + -1.25 Combine like terms: -7.846177413 + -1.25 = -9.096177413 x = -9.096177413 Simplifying x = -9.096177413

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.596177413, -9.096177413}

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