13x^2+6x-4=0

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Solution for 13x^2+6x-4=0 equation:


Simplifying
13x2 + 6x + -4 = 0

Reorder the terms:
-4 + 6x + 13x2 = 0

Solving
-4 + 6x + 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'.
-0.3076923077 + 0.4615384615x + x2 = 0

Move the constant term to the right:

Add '0.3076923077' to each side of the equation.
-0.3076923077 + 0.4615384615x + 0.3076923077 + x2 = 0 + 0.3076923077

Reorder the terms:
-0.3076923077 + 0.3076923077 + 0.4615384615x + x2 = 0 + 0.3076923077

Combine like terms: -0.3076923077 + 0.3076923077 = 0.0000000000
0.0000000000 + 0.4615384615x + x2 = 0 + 0.3076923077
0.4615384615x + x2 = 0 + 0.3076923077

Combine like terms: 0 + 0.3076923077 = 0.3076923077
0.4615384615x + x2 = 0.3076923077

The x term is 0.4615384615x.  Take half its coefficient (0.2307692308).
Square it (0.05325443788) and add it to both sides.

Add '0.05325443788' to each side of the equation.
0.4615384615x + 0.05325443788 + x2 = 0.3076923077 + 0.05325443788

Reorder the terms:
0.05325443788 + 0.4615384615x + x2 = 0.3076923077 + 0.05325443788

Combine like terms: 0.3076923077 + 0.05325443788 = 0.36094674558
0.05325443788 + 0.4615384615x + x2 = 0.36094674558

Factor a perfect square on the left side:
(x + 0.2307692308)(x + 0.2307692308) = 0.36094674558

Calculate the square root of the right side: 0.600788437

Break this problem into two subproblems by setting 
(x + 0.2307692308) equal to 0.600788437 and -0.600788437.

Subproblem 1

x + 0.2307692308 = 0.600788437 Simplifying x + 0.2307692308 = 0.600788437 Reorder the terms: 0.2307692308 + x = 0.600788437 Solving 0.2307692308 + x = 0.600788437 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2307692308' to each side of the equation. 0.2307692308 + -0.2307692308 + x = 0.600788437 + -0.2307692308 Combine like terms: 0.2307692308 + -0.2307692308 = 0.0000000000 0.0000000000 + x = 0.600788437 + -0.2307692308 x = 0.600788437 + -0.2307692308 Combine like terms: 0.600788437 + -0.2307692308 = 0.3700192062 x = 0.3700192062 Simplifying x = 0.3700192062

Subproblem 2

x + 0.2307692308 = -0.600788437 Simplifying x + 0.2307692308 = -0.600788437 Reorder the terms: 0.2307692308 + x = -0.600788437 Solving 0.2307692308 + x = -0.600788437 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2307692308' to each side of the equation. 0.2307692308 + -0.2307692308 + x = -0.600788437 + -0.2307692308 Combine like terms: 0.2307692308 + -0.2307692308 = 0.0000000000 0.0000000000 + x = -0.600788437 + -0.2307692308 x = -0.600788437 + -0.2307692308 Combine like terms: -0.600788437 + -0.2307692308 = -0.8315576678 x = -0.8315576678 Simplifying x = -0.8315576678

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.3700192062, -0.8315576678}

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