3x^2+13x=4

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Solution for 3x^2+13x=4 equation: 


Simplifying
3x2 + 13x = 4

Reorder the terms:
13x + 3x2 = 4

Solving
13x + 3x2 = 4

Solving for variable 'x'.

Reorder the terms:
-4 + 13x + 3x2 = 4 + -4

Combine like terms: 4 + -4 = 0
-4 + 13x + 3x2 = 0

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

Divide each side by '3'.
-1.333333333 + 4.333333333x + x2 = 0

Move the constant term to the right:

Add '1.333333333' to each side of the equation.
-1.333333333 + 4.333333333x + 1.333333333 + x2 = 0 + 1.333333333

Reorder the terms:
-1.333333333 + 1.333333333 + 4.333333333x + x2 = 0 + 1.333333333

Combine like terms: -1.333333333 + 1.333333333 = 0.000000000
0.000000000 + 4.333333333x + x2 = 0 + 1.333333333
4.333333333x + x2 = 0 + 1.333333333

Combine like terms: 0 + 1.333333333 = 1.333333333
4.333333333x + x2 = 1.333333333

The x term is 4.333333333x.  Take half its coefficient (2.166666667).
Square it (4.694444446) and add it to both sides.

Add '4.694444446' to each side of the equation.
4.333333333x + 4.694444446 + x2 = 1.333333333 + 4.694444446

Reorder the terms:
4.694444446 + 4.333333333x + x2 = 1.333333333 + 4.694444446

Combine like terms: 1.333333333 + 4.694444446 = 6.027777779
4.694444446 + 4.333333333x + x2 = 6.027777779

Factor a perfect square on the left side:
(x + 2.166666667)(x + 2.166666667) = 6.027777779

Calculate the square root of the right side: 2.455153311

Break this problem into two subproblems by setting 
(x + 2.166666667) equal to 2.455153311 and -2.455153311.


Subproblem 1
x + 2.166666667 = 2.455153311

Simplifying
x + 2.166666667 = 2.455153311

Reorder the terms:
2.166666667 + x = 2.455153311

Solving
2.166666667 + x = 2.455153311

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-2.166666667' to each side of the equation.
2.166666667 + -2.166666667 + x = 2.455153311 + -2.166666667

Combine like terms: 2.166666667 + -2.166666667 = 0.000000000
0.000000000 + x = 2.455153311 + -2.166666667
x = 2.455153311 + -2.166666667

Combine like terms: 2.455153311 + -2.166666667 = 0.288486644
x = 0.288486644

Simplifying
x = 0.288486644


Subproblem 2
x + 2.166666667 = -2.455153311

Simplifying
x + 2.166666667 = -2.455153311

Reorder the terms:
2.166666667 + x = -2.455153311

Solving
2.166666667 + x = -2.455153311

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-2.166666667' to each side of the equation.
2.166666667 + -2.166666667 + x = -2.455153311 + -2.166666667

Combine like terms: 2.166666667 + -2.166666667 = 0.000000000
0.000000000 + x = -2.455153311 + -2.166666667
x = -2.455153311 + -2.166666667

Combine like terms: -2.455153311 + -2.166666667 = -4.621819978
x = -4.621819978

Simplifying
x = -4.621819978


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.288486644, -4.621819978}

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