5x^2+13x+4=0

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Solution for 5x^2+13x+4=0 equation:


Simplifying
5x2 + 13x + 4 = 0

Reorder the terms:
4 + 13x + 5x2 = 0

Solving
4 + 13x + 5x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
0.8 + 2.6x + x2 = 0

Move the constant term to the right:

Add '-0.8' to each side of the equation.
0.8 + 2.6x + -0.8 + x2 = 0 + -0.8

Reorder the terms:
0.8 + -0.8 + 2.6x + x2 = 0 + -0.8

Combine like terms: 0.8 + -0.8 = 0.0
0.0 + 2.6x + x2 = 0 + -0.8
2.6x + x2 = 0 + -0.8

Combine like terms: 0 + -0.8 = -0.8
2.6x + x2 = -0.8

The x term is 2.6x.  Take half its coefficient (1.3).
Square it (1.69) and add it to both sides.

Add '1.69' to each side of the equation.
2.6x + 1.69 + x2 = -0.8 + 1.69

Reorder the terms:
1.69 + 2.6x + x2 = -0.8 + 1.69

Combine like terms: -0.8 + 1.69 = 0.89
1.69 + 2.6x + x2 = 0.89

Factor a perfect square on the left side:
(x + 1.3)(x + 1.3) = 0.89

Calculate the square root of the right side: 0.943398113

Break this problem into two subproblems by setting 
(x + 1.3) equal to 0.943398113 and -0.943398113.

Subproblem 1

x + 1.3 = 0.943398113 Simplifying x + 1.3 = 0.943398113 Reorder the terms: 1.3 + x = 0.943398113 Solving 1.3 + x = 0.943398113 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.3' to each side of the equation. 1.3 + -1.3 + x = 0.943398113 + -1.3 Combine like terms: 1.3 + -1.3 = 0.0 0.0 + x = 0.943398113 + -1.3 x = 0.943398113 + -1.3 Combine like terms: 0.943398113 + -1.3 = -0.356601887 x = -0.356601887 Simplifying x = -0.356601887

Subproblem 2

x + 1.3 = -0.943398113 Simplifying x + 1.3 = -0.943398113 Reorder the terms: 1.3 + x = -0.943398113 Solving 1.3 + x = -0.943398113 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.3' to each side of the equation. 1.3 + -1.3 + x = -0.943398113 + -1.3 Combine like terms: 1.3 + -1.3 = 0.0 0.0 + x = -0.943398113 + -1.3 x = -0.943398113 + -1.3 Combine like terms: -0.943398113 + -1.3 = -2.243398113 x = -2.243398113 Simplifying x = -2.243398113

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.356601887, -2.243398113}

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