13x^2+26x+4=0

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Solution for 13x^2+26x+4=0 equation:


Simplifying
13x2 + 26x + 4 = 0

Reorder the terms:
4 + 26x + 13x2 = 0

Solving
4 + 26x + 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 + 2x + x2 = 0

Move the constant term to the right:

Add '-0.3076923077' to each side of the equation.
0.3076923077 + 2x + -0.3076923077 + x2 = 0 + -0.3076923077

Reorder the terms:
0.3076923077 + -0.3076923077 + 2x + x2 = 0 + -0.3076923077

Combine like terms: 0.3076923077 + -0.3076923077 = 0.0000000000
0.0000000000 + 2x + x2 = 0 + -0.3076923077
2x + x2 = 0 + -0.3076923077

Combine like terms: 0 + -0.3076923077 = -0.3076923077
2x + x2 = -0.3076923077

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = -0.3076923077 + 1

Reorder the terms:
1 + 2x + x2 = -0.3076923077 + 1

Combine like terms: -0.3076923077 + 1 = 0.6923076923
1 + 2x + x2 = 0.6923076923

Factor a perfect square on the left side:
(x + 1)(x + 1) = 0.6923076923

Calculate the square root of the right side: 0.832050294

Break this problem into two subproblems by setting 
(x + 1) equal to 0.832050294 and -0.832050294.

Subproblem 1

x + 1 = 0.832050294 Simplifying x + 1 = 0.832050294 Reorder the terms: 1 + x = 0.832050294 Solving 1 + x = 0.832050294 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 0.832050294 + -1 Combine like terms: 1 + -1 = 0 0 + x = 0.832050294 + -1 x = 0.832050294 + -1 Combine like terms: 0.832050294 + -1 = -0.167949706 x = -0.167949706 Simplifying x = -0.167949706

Subproblem 2

x + 1 = -0.832050294 Simplifying x + 1 = -0.832050294 Reorder the terms: 1 + x = -0.832050294 Solving 1 + x = -0.832050294 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -0.832050294 + -1 Combine like terms: 1 + -1 = 0 0 + x = -0.832050294 + -1 x = -0.832050294 + -1 Combine like terms: -0.832050294 + -1 = -1.832050294 x = -1.832050294 Simplifying x = -1.832050294

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.167949706, -1.832050294}

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