2x^2+13x+4=0

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


Simplifying
2x2 + 13x + 4 = 0

Reorder the terms:
4 + 13x + 2x2 = 0

Solving
4 + 13x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
2 + 6.5x + x2 = 0

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + 6.5x + -2 + x2 = 0 + -2

Reorder the terms:
2 + -2 + 6.5x + x2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + 6.5x + x2 = 0 + -2
6.5x + x2 = 0 + -2

Combine like terms: 0 + -2 = -2
6.5x + x2 = -2

The x term is 6.5x.  Take half its coefficient (3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
6.5x + 10.5625 + x2 = -2 + 10.5625

Reorder the terms:
10.5625 + 6.5x + x2 = -2 + 10.5625

Combine like terms: -2 + 10.5625 = 8.5625
10.5625 + 6.5x + x2 = 8.5625

Factor a perfect square on the left side:
(x + 3.25)(x + 3.25) = 8.5625

Calculate the square root of the right side: 2.926174978

Break this problem into two subproblems by setting 
(x + 3.25) equal to 2.926174978 and -2.926174978.

Subproblem 1

x + 3.25 = 2.926174978 Simplifying x + 3.25 = 2.926174978 Reorder the terms: 3.25 + x = 2.926174978 Solving 3.25 + x = 2.926174978 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = 2.926174978 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = 2.926174978 + -3.25 x = 2.926174978 + -3.25 Combine like terms: 2.926174978 + -3.25 = -0.323825022 x = -0.323825022 Simplifying x = -0.323825022

Subproblem 2

x + 3.25 = -2.926174978 Simplifying x + 3.25 = -2.926174978 Reorder the terms: 3.25 + x = -2.926174978 Solving 3.25 + x = -2.926174978 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = -2.926174978 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = -2.926174978 + -3.25 x = -2.926174978 + -3.25 Combine like terms: -2.926174978 + -3.25 = -6.176174978 x = -6.176174978 Simplifying x = -6.176174978

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.323825022, -6.176174978}

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