(4x^2)+16x+13=0

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Solution for (4x^2)+16x+13=0 equation:


Simplifying
(4x2) + 16x + 13 = 0

Reorder the terms:
13 + 16x + (4x2) = 0

Solving
13 + 16x + (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'.
3.25 + 4x + x2 = 0

Move the constant term to the right:

Add '-3.25' to each side of the equation.
3.25 + 4x + -3.25 + x2 = 0 + -3.25

Reorder the terms:
3.25 + -3.25 + 4x + x2 = 0 + -3.25

Combine like terms: 3.25 + -3.25 = 0.00
0.00 + 4x + x2 = 0 + -3.25
4x + x2 = 0 + -3.25

Combine like terms: 0 + -3.25 = -3.25
4x + x2 = -3.25

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = -3.25 + 4

Reorder the terms:
4 + 4x + x2 = -3.25 + 4

Combine like terms: -3.25 + 4 = 0.75
4 + 4x + x2 = 0.75

Factor a perfect square on the left side:
((x) + 2)((x) + 2) = 0.75

Calculate the square root of the right side: 0.866025404

Break this problem into two subproblems by setting 
((x) + 2) equal to 0.866025404 and -0.866025404.

Subproblem 1

(x) + 2 = 0.866025404 Simplifying (x) + 2 = 0.866025404 x + 2 = 0.866025404 Reorder the terms: 2 + x = 0.866025404 Solving 2 + x = 0.866025404 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 0.866025404 + -2 Combine like terms: 2 + -2 = 0 0 + x = 0.866025404 + -2 x = 0.866025404 + -2 Combine like terms: 0.866025404 + -2 = -1.133974596 x = -1.133974596 Simplifying x = -1.133974596

Subproblem 2

(x) + 2 = -0.866025404 Simplifying (x) + 2 = -0.866025404 x + 2 = -0.866025404 Reorder the terms: 2 + x = -0.866025404 Solving 2 + x = -0.866025404 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -0.866025404 + -2 Combine like terms: 2 + -2 = 0 0 + x = -0.866025404 + -2 x = -0.866025404 + -2 Combine like terms: -0.866025404 + -2 = -2.866025404 x = -2.866025404 Simplifying x = -2.866025404

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.133974596, -2.866025404}

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