2x+3x(x-5)=20

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Solution for 2x+3x(x-5)=20 equation: 


Simplifying
2x + 3x(x + -5) = 20

Reorder the terms:
2x + 3x(-5 + x) = 20
2x + (-5 * 3x + x * 3x) = 20
2x + (-15x + 3x2) = 20

Combine like terms: 2x + -15x = -13x
-13x + 3x2 = 20

Solving
-13x + 3x2 = 20

Solving for variable 'x'.

Reorder the terms:
-20 + -13x + 3x2 = 20 + -20

Combine like terms: 20 + -20 = 0
-20 + -13x + 3x2 = 0

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

Divide each side by '3'.
-6.666666667 + -4.333333333x + x2 = 0

Move the constant term to the right:

Add '6.666666667' to each side of the equation.
-6.666666667 + -4.333333333x + 6.666666667 + x2 = 0 + 6.666666667

Reorder the terms:
-6.666666667 + 6.666666667 + -4.333333333x + x2 = 0 + 6.666666667

Combine like terms: -6.666666667 + 6.666666667 = 0.000000000
0.000000000 + -4.333333333x + x2 = 0 + 6.666666667
-4.333333333x + x2 = 0 + 6.666666667

Combine like terms: 0 + 6.666666667 = 6.666666667
-4.333333333x + x2 = 6.666666667

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 = 6.666666667 + 4.694444446

Reorder the terms:
4.694444446 + -4.333333333x + x2 = 6.666666667 + 4.694444446

Combine like terms: 6.666666667 + 4.694444446 = 11.361111113
4.694444446 + -4.333333333x + x2 = 11.361111113

Factor a perfect square on the left side:
(x + -2.166666667)(x + -2.166666667) = 11.361111113

Calculate the square root of the right side: 3.370624736

Break this problem into two subproblems by setting 
(x + -2.166666667) equal to 3.370624736 and -3.370624736.


Subproblem 1
x + -2.166666667 = 3.370624736

Simplifying
x + -2.166666667 = 3.370624736

Reorder the terms:
-2.166666667 + x = 3.370624736

Solving
-2.166666667 + x = 3.370624736

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 = 3.370624736 + 2.166666667

Combine like terms: -2.166666667 + 2.166666667 = 0.000000000
0.000000000 + x = 3.370624736 + 2.166666667
x = 3.370624736 + 2.166666667

Combine like terms: 3.370624736 + 2.166666667 = 5.537291403
x = 5.537291403

Simplifying
x = 5.537291403


Subproblem 2
x + -2.166666667 = -3.370624736

Simplifying
x + -2.166666667 = -3.370624736

Reorder the terms:
-2.166666667 + x = -3.370624736

Solving
-2.166666667 + x = -3.370624736

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 = -3.370624736 + 2.166666667

Combine like terms: -2.166666667 + 2.166666667 = 0.000000000
0.000000000 + x = -3.370624736 + 2.166666667
x = -3.370624736 + 2.166666667

Combine like terms: -3.370624736 + 2.166666667 = -1.203958069
x = -1.203958069

Simplifying
x = -1.203958069


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {5.537291403, -1.203958069}

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