13x^2+5x-5=0

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Solution for 13x^2+5x-5=0 equation:


Simplifying
13x2 + 5x + -5 = 0

Reorder the terms:
-5 + 5x + 13x2 = 0

Solving
-5 + 5x + 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'.
-0.3846153846 + 0.3846153846x + x2 = 0

Move the constant term to the right:

Add '0.3846153846' to each side of the equation.
-0.3846153846 + 0.3846153846x + 0.3846153846 + x2 = 0 + 0.3846153846

Reorder the terms:
-0.3846153846 + 0.3846153846 + 0.3846153846x + x2 = 0 + 0.3846153846

Combine like terms: -0.3846153846 + 0.3846153846 = 0.0000000000
0.0000000000 + 0.3846153846x + x2 = 0 + 0.3846153846
0.3846153846x + x2 = 0 + 0.3846153846

Combine like terms: 0 + 0.3846153846 = 0.3846153846
0.3846153846x + x2 = 0.3846153846

The x term is 0.3846153846x.  Take half its coefficient (0.1923076923).
Square it (0.03698224852) and add it to both sides.

Add '0.03698224852' to each side of the equation.
0.3846153846x + 0.03698224852 + x2 = 0.3846153846 + 0.03698224852

Reorder the terms:
0.03698224852 + 0.3846153846x + x2 = 0.3846153846 + 0.03698224852

Combine like terms: 0.3846153846 + 0.03698224852 = 0.42159763312
0.03698224852 + 0.3846153846x + x2 = 0.42159763312

Factor a perfect square on the left side:
(x + 0.1923076923)(x + 0.1923076923) = 0.42159763312

Calculate the square root of the right side: 0.649305501

Break this problem into two subproblems by setting 
(x + 0.1923076923) equal to 0.649305501 and -0.649305501.

Subproblem 1

x + 0.1923076923 = 0.649305501 Simplifying x + 0.1923076923 = 0.649305501 Reorder the terms: 0.1923076923 + x = 0.649305501 Solving 0.1923076923 + x = 0.649305501 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1923076923' to each side of the equation. 0.1923076923 + -0.1923076923 + x = 0.649305501 + -0.1923076923 Combine like terms: 0.1923076923 + -0.1923076923 = 0.0000000000 0.0000000000 + x = 0.649305501 + -0.1923076923 x = 0.649305501 + -0.1923076923 Combine like terms: 0.649305501 + -0.1923076923 = 0.4569978087 x = 0.4569978087 Simplifying x = 0.4569978087

Subproblem 2

x + 0.1923076923 = -0.649305501 Simplifying x + 0.1923076923 = -0.649305501 Reorder the terms: 0.1923076923 + x = -0.649305501 Solving 0.1923076923 + x = -0.649305501 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1923076923' to each side of the equation. 0.1923076923 + -0.1923076923 + x = -0.649305501 + -0.1923076923 Combine like terms: 0.1923076923 + -0.1923076923 = 0.0000000000 0.0000000000 + x = -0.649305501 + -0.1923076923 x = -0.649305501 + -0.1923076923 Combine like terms: -0.649305501 + -0.1923076923 = -0.8416131933 x = -0.8416131933 Simplifying x = -0.8416131933

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.4569978087, -0.8416131933}

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