x(3x+5)=4

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Solution for x(3x+5)=4 equation: 


Simplifying
x(3x + 5) = 4

Reorder the terms:
x(5 + 3x) = 4
(5 * x + 3x * x) = 4
(5x + 3x2) = 4

Solving
5x + 3x2 = 4

Solving for variable 'x'.

Reorder the terms:
-4 + 5x + 3x2 = 4 + -4

Combine like terms: 4 + -4 = 0
-4 + 5x + 3x2 = 0

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

Divide each side by '3'.
-1.333333333 + 1.666666667x + x2 = 0

Move the constant term to the right:

Add '1.333333333' to each side of the equation.
-1.333333333 + 1.666666667x + 1.333333333 + x2 = 0 + 1.333333333

Reorder the terms:
-1.333333333 + 1.333333333 + 1.666666667x + x2 = 0 + 1.333333333

Combine like terms: -1.333333333 + 1.333333333 = 0.000000000
0.000000000 + 1.666666667x + x2 = 0 + 1.333333333
1.666666667x + x2 = 0 + 1.333333333

Combine like terms: 0 + 1.333333333 = 1.333333333
1.666666667x + x2 = 1.333333333

The x term is 1.666666667x.  Take half its coefficient (0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
1.666666667x + 0.6944444447 + x2 = 1.333333333 + 0.6944444447

Reorder the terms:
0.6944444447 + 1.666666667x + x2 = 1.333333333 + 0.6944444447

Combine like terms: 1.333333333 + 0.6944444447 = 2.0277777777
0.6944444447 + 1.666666667x + x2 = 2.0277777777

Factor a perfect square on the left side:
(x + 0.8333333335)(x + 0.8333333335) = 2.0277777777

Calculate the square root of the right side: 1.424000624

Break this problem into two subproblems by setting 
(x + 0.8333333335) equal to 1.424000624 and -1.424000624.


Subproblem 1
x + 0.8333333335 = 1.424000624

Simplifying
x + 0.8333333335 = 1.424000624

Reorder the terms:
0.8333333335 + x = 1.424000624

Solving
0.8333333335 + x = 1.424000624

Solving for variable 'x'.

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

Add '-0.8333333335' to each side of the equation.
0.8333333335 + -0.8333333335 + x = 1.424000624 + -0.8333333335

Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000
0.0000000000 + x = 1.424000624 + -0.8333333335
x = 1.424000624 + -0.8333333335

Combine like terms: 1.424000624 + -0.8333333335 = 0.5906672905
x = 0.5906672905

Simplifying
x = 0.5906672905


Subproblem 2
x + 0.8333333335 = -1.424000624

Simplifying
x + 0.8333333335 = -1.424000624

Reorder the terms:
0.8333333335 + x = -1.424000624

Solving
0.8333333335 + x = -1.424000624

Solving for variable 'x'.

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

Add '-0.8333333335' to each side of the equation.
0.8333333335 + -0.8333333335 + x = -1.424000624 + -0.8333333335

Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000
0.0000000000 + x = -1.424000624 + -0.8333333335
x = -1.424000624 + -0.8333333335

Combine like terms: -1.424000624 + -0.8333333335 = -2.2573339575
x = -2.2573339575

Simplifying
x = -2.2573339575


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.5906672905, -2.2573339575}

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