3x(2x+20)=90

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Solution for 3x(2x+20)=90 equation: 


Simplifying
3x(2x + 20) = 90

Reorder the terms:
3x(20 + 2x) = 90
(20 * 3x + 2x * 3x) = 90
(60x + 6x2) = 90

Solving
60x + 6x2 = 90

Solving for variable 'x'.

Reorder the terms:
-90 + 60x + 6x2 = 90 + -90

Combine like terms: 90 + -90 = 0
-90 + 60x + 6x2 = 0

Factor out the Greatest Common Factor (GCF), '6'.
6(-15 + 10x + x2) = 0

Ignore the factor 6.

Subproblem 1
Set the factor '(-15 + 10x + x2)' equal to zero and attempt to solve:

Simplifying
-15 + 10x + x2 = 0

Solving
-15 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + 10x + 15 + x2 = 0 + 15

Reorder the terms:
-15 + 15 + 10x + x2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 10x + x2 = 0 + 15
10x + x2 = 0 + 15

Combine like terms: 0 + 15 = 15
10x + x2 = 15

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 15 + 25

Reorder the terms:
25 + 10x + x2 = 15 + 25

Combine like terms: 15 + 25 = 40
25 + 10x + x2 = 40

Factor a perfect square on the left side:
(x + 5)(x + 5) = 40

Calculate the square root of the right side: 6.32455532

Break this problem into two subproblems by setting 
(x + 5) equal to 6.32455532 and -6.32455532.


Subproblem 1
x + 5 = 6.32455532

Simplifying
x + 5 = 6.32455532

Reorder the terms:
5 + x = 6.32455532

Solving
5 + x = 6.32455532

Solving for variable 'x'.

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

Add '-5' to each side of the equation.
5 + -5 + x = 6.32455532 + -5

Combine like terms: 5 + -5 = 0
0 + x = 6.32455532 + -5
x = 6.32455532 + -5

Combine like terms: 6.32455532 + -5 = 1.32455532
x = 1.32455532

Simplifying
x = 1.32455532


Subproblem 2
x + 5 = -6.32455532

Simplifying
x + 5 = -6.32455532

Reorder the terms:
5 + x = -6.32455532

Solving
5 + x = -6.32455532

Solving for variable 'x'.

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

Add '-5' to each side of the equation.
5 + -5 + x = -6.32455532 + -5

Combine like terms: 5 + -5 = 0
0 + x = -6.32455532 + -5
x = -6.32455532 + -5

Combine like terms: -6.32455532 + -5 = -11.32455532
x = -11.32455532

Simplifying
x = -11.32455532


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {1.32455532, -11.32455532}
Solution
x = {1.32455532, -11.32455532}

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