13x^2-3x-6=0

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Solution for 13x^2-3x-6=0 equation:


Simplifying
13x2 + -3x + -6 = 0

Reorder the terms:
-6 + -3x + 13x2 = 0

Solving
-6 + -3x + 13x2 = 0

Solving for variable 'x'.

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

Divide each side by '13'.
-0.4615384615 + -0.2307692308x + x2 = 0

Move the constant term to the right:

Add '0.4615384615' to each side of the equation.
-0.4615384615 + -0.2307692308x + 0.4615384615 + x2 = 0 + 0.4615384615

Reorder the terms:
-0.4615384615 + 0.4615384615 + -0.2307692308x + x2 = 0 + 0.4615384615

Combine like terms: -0.4615384615 + 0.4615384615 = 0.0000000000
0.0000000000 + -0.2307692308x + x2 = 0 + 0.4615384615
-0.2307692308x + x2 = 0 + 0.4615384615

Combine like terms: 0 + 0.4615384615 = 0.4615384615
-0.2307692308x + x2 = 0.4615384615

The x term is -0.2307692308x.  Take half its coefficient (-0.1153846154).
Square it (0.01331360947) and add it to both sides.

Add '0.01331360947' to each side of the equation.
-0.2307692308x + 0.01331360947 + x2 = 0.4615384615 + 0.01331360947

Reorder the terms:
0.01331360947 + -0.2307692308x + x2 = 0.4615384615 + 0.01331360947

Combine like terms: 0.4615384615 + 0.01331360947 = 0.47485207097
0.01331360947 + -0.2307692308x + x2 = 0.47485207097

Factor a perfect square on the left side:
(x + -0.1153846154)(x + -0.1153846154) = 0.47485207097

Calculate the square root of the right side: 0.68909511

Break this problem into two subproblems by setting 
(x + -0.1153846154) equal to 0.68909511 and -0.68909511.

Subproblem 1

x + -0.1153846154 = 0.68909511 Simplifying x + -0.1153846154 = 0.68909511 Reorder the terms: -0.1153846154 + x = 0.68909511 Solving -0.1153846154 + x = 0.68909511 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1153846154' to each side of the equation. -0.1153846154 + 0.1153846154 + x = 0.68909511 + 0.1153846154 Combine like terms: -0.1153846154 + 0.1153846154 = 0.0000000000 0.0000000000 + x = 0.68909511 + 0.1153846154 x = 0.68909511 + 0.1153846154 Combine like terms: 0.68909511 + 0.1153846154 = 0.8044797254 x = 0.8044797254 Simplifying x = 0.8044797254

Subproblem 2

x + -0.1153846154 = -0.68909511 Simplifying x + -0.1153846154 = -0.68909511 Reorder the terms: -0.1153846154 + x = -0.68909511 Solving -0.1153846154 + x = -0.68909511 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1153846154' to each side of the equation. -0.1153846154 + 0.1153846154 + x = -0.68909511 + 0.1153846154 Combine like terms: -0.1153846154 + 0.1153846154 = 0.0000000000 0.0000000000 + x = -0.68909511 + 0.1153846154 x = -0.68909511 + 0.1153846154 Combine like terms: -0.68909511 + 0.1153846154 = -0.5737104946 x = -0.5737104946 Simplifying x = -0.5737104946

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.8044797254, -0.5737104946}

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