13x^2-3x-4=0

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Solution for 13x^2-3x-4=0 equation:


Simplifying
13x2 + -3x + -4 = 0

Reorder the terms:
-4 + -3x + 13x2 = 0

Solving
-4 + -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'.
-0.3076923077 + -0.2307692308x + x2 = 0

Move the constant term to the right:

Add '0.3076923077' to each side of the equation.
-0.3076923077 + -0.2307692308x + 0.3076923077 + x2 = 0 + 0.3076923077

Reorder the terms:
-0.3076923077 + 0.3076923077 + -0.2307692308x + x2 = 0 + 0.3076923077

Combine like terms: -0.3076923077 + 0.3076923077 = 0.0000000000
0.0000000000 + -0.2307692308x + x2 = 0 + 0.3076923077
-0.2307692308x + x2 = 0 + 0.3076923077

Combine like terms: 0 + 0.3076923077 = 0.3076923077
-0.2307692308x + x2 = 0.3076923077

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 = 0.3076923077 + 0.01331360947

Reorder the terms:
0.01331360947 + -0.2307692308x + x2 = 0.3076923077 + 0.01331360947

Combine like terms: 0.3076923077 + 0.01331360947 = 0.32100591717
0.01331360947 + -0.2307692308x + x2 = 0.32100591717

Factor a perfect square on the left side:
(x + -0.1153846154)(x + -0.1153846154) = 0.32100591717

Calculate the square root of the right side: 0.566573841

Break this problem into two subproblems by setting 
(x + -0.1153846154) equal to 0.566573841 and -0.566573841.

Subproblem 1

x + -0.1153846154 = 0.566573841 Simplifying x + -0.1153846154 = 0.566573841 Reorder the terms: -0.1153846154 + x = 0.566573841 Solving -0.1153846154 + x = 0.566573841 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 = 0.566573841 + 0.1153846154 Combine like terms: -0.1153846154 + 0.1153846154 = 0.0000000000 0.0000000000 + x = 0.566573841 + 0.1153846154 x = 0.566573841 + 0.1153846154 Combine like terms: 0.566573841 + 0.1153846154 = 0.6819584564 x = 0.6819584564 Simplifying x = 0.6819584564

Subproblem 2

x + -0.1153846154 = -0.566573841 Simplifying x + -0.1153846154 = -0.566573841 Reorder the terms: -0.1153846154 + x = -0.566573841 Solving -0.1153846154 + x = -0.566573841 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 = -0.566573841 + 0.1153846154 Combine like terms: -0.1153846154 + 0.1153846154 = 0.0000000000 0.0000000000 + x = -0.566573841 + 0.1153846154 x = -0.566573841 + 0.1153846154 Combine like terms: -0.566573841 + 0.1153846154 = -0.4511892256 x = -0.4511892256 Simplifying x = -0.4511892256

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.6819584564, -0.4511892256}

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