13x^2+50x+39=0

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Solution for 13x^2+50x+39=0 equation:


Simplifying
13x2 + 50x + 39 = 0

Reorder the terms:
39 + 50x + 13x2 = 0

Solving
39 + 50x + 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'.
3 + 3.846153846x + x2 = 0

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + 3.846153846x + -3 + x2 = 0 + -3

Reorder the terms:
3 + -3 + 3.846153846x + x2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 3.846153846x + x2 = 0 + -3
3.846153846x + x2 = 0 + -3

Combine like terms: 0 + -3 = -3
3.846153846x + x2 = -3

The x term is 3.846153846x.  Take half its coefficient (1.923076923).
Square it (3.698224852) and add it to both sides.

Add '3.698224852' to each side of the equation.
3.846153846x + 3.698224852 + x2 = -3 + 3.698224852

Reorder the terms:
3.698224852 + 3.846153846x + x2 = -3 + 3.698224852

Combine like terms: -3 + 3.698224852 = 0.698224852
3.698224852 + 3.846153846x + x2 = 0.698224852

Factor a perfect square on the left side:
(x + 1.923076923)(x + 1.923076923) = 0.698224852

Calculate the square root of the right side: 0.835598499

Break this problem into two subproblems by setting 
(x + 1.923076923) equal to 0.835598499 and -0.835598499.

Subproblem 1

x + 1.923076923 = 0.835598499 Simplifying x + 1.923076923 = 0.835598499 Reorder the terms: 1.923076923 + x = 0.835598499 Solving 1.923076923 + x = 0.835598499 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.923076923' to each side of the equation. 1.923076923 + -1.923076923 + x = 0.835598499 + -1.923076923 Combine like terms: 1.923076923 + -1.923076923 = 0.000000000 0.000000000 + x = 0.835598499 + -1.923076923 x = 0.835598499 + -1.923076923 Combine like terms: 0.835598499 + -1.923076923 = -1.087478424 x = -1.087478424 Simplifying x = -1.087478424

Subproblem 2

x + 1.923076923 = -0.835598499 Simplifying x + 1.923076923 = -0.835598499 Reorder the terms: 1.923076923 + x = -0.835598499 Solving 1.923076923 + x = -0.835598499 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.923076923' to each side of the equation. 1.923076923 + -1.923076923 + x = -0.835598499 + -1.923076923 Combine like terms: 1.923076923 + -1.923076923 = 0.000000000 0.000000000 + x = -0.835598499 + -1.923076923 x = -0.835598499 + -1.923076923 Combine like terms: -0.835598499 + -1.923076923 = -2.758675422 x = -2.758675422 Simplifying x = -2.758675422

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.087478424, -2.758675422}

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