3x(x+2)+2x=61

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Solution for 3x(x+2)+2x=61 equation: 


Simplifying
3x(x + 2) + 2x = 61

Reorder the terms:
3x(2 + x) + 2x = 61
(2 * 3x + x * 3x) + 2x = 61
(6x + 3x2) + 2x = 61

Reorder the terms:
6x + 2x + 3x2 = 61

Combine like terms: 6x + 2x = 8x
8x + 3x2 = 61

Solving
8x + 3x2 = 61

Solving for variable 'x'.

Reorder the terms:
-61 + 8x + 3x2 = 61 + -61

Combine like terms: 61 + -61 = 0
-61 + 8x + 3x2 = 0

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

Divide each side by '3'.
-20.33333333 + 2.666666667x + x2 = 0

Move the constant term to the right:

Add '20.33333333' to each side of the equation.
-20.33333333 + 2.666666667x + 20.33333333 + x2 = 0 + 20.33333333

Reorder the terms:
-20.33333333 + 20.33333333 + 2.666666667x + x2 = 0 + 20.33333333

Combine like terms: -20.33333333 + 20.33333333 = 0.00000000
0.00000000 + 2.666666667x + x2 = 0 + 20.33333333
2.666666667x + x2 = 0 + 20.33333333

Combine like terms: 0 + 20.33333333 = 20.33333333
2.666666667x + x2 = 20.33333333

The x term is 2.666666667x.  Take half its coefficient (1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
2.666666667x + 1.777777780 + x2 = 20.33333333 + 1.777777780

Reorder the terms:
1.777777780 + 2.666666667x + x2 = 20.33333333 + 1.777777780

Combine like terms: 20.33333333 + 1.777777780 = 22.11111111
1.777777780 + 2.666666667x + x2 = 22.11111111

Factor a perfect square on the left side:
(x + 1.333333334)(x + 1.333333334) = 22.11111111

Calculate the square root of the right side: 4.702245326

Break this problem into two subproblems by setting 
(x + 1.333333334) equal to 4.702245326 and -4.702245326.


Subproblem 1
x + 1.333333334 = 4.702245326

Simplifying
x + 1.333333334 = 4.702245326

Reorder the terms:
1.333333334 + x = 4.702245326

Solving
1.333333334 + x = 4.702245326

Solving for variable 'x'.

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

Add '-1.333333334' to each side of the equation.
1.333333334 + -1.333333334 + x = 4.702245326 + -1.333333334

Combine like terms: 1.333333334 + -1.333333334 = 0.000000000
0.000000000 + x = 4.702245326 + -1.333333334
x = 4.702245326 + -1.333333334

Combine like terms: 4.702245326 + -1.333333334 = 3.368911992
x = 3.368911992

Simplifying
x = 3.368911992


Subproblem 2
x + 1.333333334 = -4.702245326

Simplifying
x + 1.333333334 = -4.702245326

Reorder the terms:
1.333333334 + x = -4.702245326

Solving
1.333333334 + x = -4.702245326

Solving for variable 'x'.

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

Add '-1.333333334' to each side of the equation.
1.333333334 + -1.333333334 + x = -4.702245326 + -1.333333334

Combine like terms: 1.333333334 + -1.333333334 = 0.000000000
0.000000000 + x = -4.702245326 + -1.333333334
x = -4.702245326 + -1.333333334

Combine like terms: -4.702245326 + -1.333333334 = -6.03557866
x = -6.03557866

Simplifying
x = -6.03557866


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {3.368911992, -6.03557866}

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