2x^2-6x-115=0

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Solution for 2x^2-6x-115=0 equation:


Simplifying
2x2 + -6x + -115 = 0

Reorder the terms:
-115 + -6x + 2x2 = 0

Solving
-115 + -6x + 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'.
-57.5 + -3x + x2 = 0

Move the constant term to the right:

Add '57.5' to each side of the equation.
-57.5 + -3x + 57.5 + x2 = 0 + 57.5

Reorder the terms:
-57.5 + 57.5 + -3x + x2 = 0 + 57.5

Combine like terms: -57.5 + 57.5 = 0.0
0.0 + -3x + x2 = 0 + 57.5
-3x + x2 = 0 + 57.5

Combine like terms: 0 + 57.5 = 57.5
-3x + x2 = 57.5

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 57.5 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 57.5 + 2.25

Combine like terms: 57.5 + 2.25 = 59.75
2.25 + -3x + x2 = 59.75

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 59.75

Calculate the square root of the right side: 7.729812417

Break this problem into two subproblems by setting 
(x + -1.5) equal to 7.729812417 and -7.729812417.

Subproblem 1

x + -1.5 = 7.729812417 Simplifying x + -1.5 = 7.729812417 Reorder the terms: -1.5 + x = 7.729812417 Solving -1.5 + x = 7.729812417 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 7.729812417 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 7.729812417 + 1.5 x = 7.729812417 + 1.5 Combine like terms: 7.729812417 + 1.5 = 9.229812417 x = 9.229812417 Simplifying x = 9.229812417

Subproblem 2

x + -1.5 = -7.729812417 Simplifying x + -1.5 = -7.729812417 Reorder the terms: -1.5 + x = -7.729812417 Solving -1.5 + x = -7.729812417 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -7.729812417 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -7.729812417 + 1.5 x = -7.729812417 + 1.5 Combine like terms: -7.729812417 + 1.5 = -6.229812417 x = -6.229812417 Simplifying x = -6.229812417

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.229812417, -6.229812417}

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