6x^2+x-39=0

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Solution for 6x^2+x-39=0 equation:


Simplifying
6x2 + x + -39 = 0

Reorder the terms:
-39 + x + 6x2 = 0

Solving
-39 + x + 6x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
6 the coefficient of the squared term: 

Divide each side by '6'.
-6.5 + 0.1666666667x + x2 = 0

Move the constant term to the right:

Add '6.5' to each side of the equation.
-6.5 + 0.1666666667x + 6.5 + x2 = 0 + 6.5

Reorder the terms:
-6.5 + 6.5 + 0.1666666667x + x2 = 0 + 6.5

Combine like terms: -6.5 + 6.5 = 0.0
0.0 + 0.1666666667x + x2 = 0 + 6.5
0.1666666667x + x2 = 0 + 6.5

Combine like terms: 0 + 6.5 = 6.5
0.1666666667x + x2 = 6.5

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.1666666667x + 0.25 + x2 = 6.5 + 0.25

Reorder the terms:
0.25 + 0.1666666667x + x2 = 6.5 + 0.25

Combine like terms: 6.5 + 0.25 = 6.75
0.25 + 0.1666666667x + x2 = 6.75

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 6.75

Calculate the square root of the right side: 2.598076211

Break this problem into two subproblems by setting 
(x + 0.5) equal to 2.598076211 and -2.598076211.

Subproblem 1

x + 0.5 = 2.598076211 Simplifying x + 0.5 = 2.598076211 Reorder the terms: 0.5 + x = 2.598076211 Solving 0.5 + x = 2.598076211 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 2.598076211 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 2.598076211 + -0.5 x = 2.598076211 + -0.5 Combine like terms: 2.598076211 + -0.5 = 2.098076211 x = 2.098076211 Simplifying x = 2.098076211

Subproblem 2

x + 0.5 = -2.598076211 Simplifying x + 0.5 = -2.598076211 Reorder the terms: 0.5 + x = -2.598076211 Solving 0.5 + x = -2.598076211 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -2.598076211 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -2.598076211 + -0.5 x = -2.598076211 + -0.5 Combine like terms: -2.598076211 + -0.5 = -3.098076211 x = -3.098076211 Simplifying x = -3.098076211

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.098076211, -3.098076211}

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