4x^2+13x+1=0

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Solution for 4x^2+13x+1=0 equation:


Simplifying
4x2 + 13x + 1 = 0

Reorder the terms:
1 + 13x + 4x2 = 0

Solving
1 + 13x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
0.25 + 3.25x + x2 = 0

Move the constant term to the right:

Add '-0.25' to each side of the equation.
0.25 + 3.25x + -0.25 + x2 = 0 + -0.25

Reorder the terms:
0.25 + -0.25 + 3.25x + x2 = 0 + -0.25

Combine like terms: 0.25 + -0.25 = 0.00
0.00 + 3.25x + x2 = 0 + -0.25
3.25x + x2 = 0 + -0.25

Combine like terms: 0 + -0.25 = -0.25
3.25x + x2 = -0.25

The x term is 3.25x.  Take half its coefficient (1.625).
Square it (2.640625) and add it to both sides.

Add '2.640625' to each side of the equation.
3.25x + 2.640625 + x2 = -0.25 + 2.640625

Reorder the terms:
2.640625 + 3.25x + x2 = -0.25 + 2.640625

Combine like terms: -0.25 + 2.640625 = 2.390625
2.640625 + 3.25x + x2 = 2.390625

Factor a perfect square on the left side:
(x + 1.625)(x + 1.625) = 2.390625

Calculate the square root of the right side: 1.54616461

Break this problem into two subproblems by setting 
(x + 1.625) equal to 1.54616461 and -1.54616461.

Subproblem 1

x + 1.625 = 1.54616461 Simplifying x + 1.625 = 1.54616461 Reorder the terms: 1.625 + x = 1.54616461 Solving 1.625 + x = 1.54616461 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.625' to each side of the equation. 1.625 + -1.625 + x = 1.54616461 + -1.625 Combine like terms: 1.625 + -1.625 = 0.000 0.000 + x = 1.54616461 + -1.625 x = 1.54616461 + -1.625 Combine like terms: 1.54616461 + -1.625 = -0.07883539 x = -0.07883539 Simplifying x = -0.07883539

Subproblem 2

x + 1.625 = -1.54616461 Simplifying x + 1.625 = -1.54616461 Reorder the terms: 1.625 + x = -1.54616461 Solving 1.625 + x = -1.54616461 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.625' to each side of the equation. 1.625 + -1.625 + x = -1.54616461 + -1.625 Combine like terms: 1.625 + -1.625 = 0.000 0.000 + x = -1.54616461 + -1.625 x = -1.54616461 + -1.625 Combine like terms: -1.54616461 + -1.625 = -3.17116461 x = -3.17116461 Simplifying x = -3.17116461

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.07883539, -3.17116461}

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