15x(3x+12)=-15

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Solution for 15x(3x+12)=-15 equation: 


Simplifying
15x(3x + 12) = -15

Reorder the terms:
15x(12 + 3x) = -15
(12 * 15x + 3x * 15x) = -15
(180x + 45x2) = -15

Solving
180x + 45x2 = -15

Solving for variable 'x'.

Reorder the terms:
15 + 180x + 45x2 = -15 + 15

Combine like terms: -15 + 15 = 0
15 + 180x + 45x2 = 0

Factor out the Greatest Common Factor (GCF), '15'.
15(1 + 12x + 3x2) = 0

Ignore the factor 15.

Subproblem 1
Set the factor '(1 + 12x + 3x2)' equal to zero and attempt to solve:

Simplifying
1 + 12x + 3x2 = 0

Solving
1 + 12x + 3x2 = 0

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

Divide each side by '3'.
0.3333333333 + 4x + x2 = 0

Move the constant term to the right:

Add '-0.3333333333' to each side of the equation.
0.3333333333 + 4x + -0.3333333333 + x2 = 0 + -0.3333333333

Reorder the terms:
0.3333333333 + -0.3333333333 + 4x + x2 = 0 + -0.3333333333

Combine like terms: 0.3333333333 + -0.3333333333 = 0.0000000000
0.0000000000 + 4x + x2 = 0 + -0.3333333333
4x + x2 = 0 + -0.3333333333

Combine like terms: 0 + -0.3333333333 = -0.3333333333
4x + x2 = -0.3333333333

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = -0.3333333333 + 4

Reorder the terms:
4 + 4x + x2 = -0.3333333333 + 4

Combine like terms: -0.3333333333 + 4 = 3.6666666667
4 + 4x + x2 = 3.6666666667

Factor a perfect square on the left side:
(x + 2)(x + 2) = 3.6666666667

Calculate the square root of the right side: 1.914854216

Break this problem into two subproblems by setting 
(x + 2) equal to 1.914854216 and -1.914854216.


Subproblem 1
x + 2 = 1.914854216

Simplifying
x + 2 = 1.914854216

Reorder the terms:
2 + x = 1.914854216

Solving
2 + x = 1.914854216

Solving for variable 'x'.

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

Add '-2' to each side of the equation.
2 + -2 + x = 1.914854216 + -2

Combine like terms: 2 + -2 = 0
0 + x = 1.914854216 + -2
x = 1.914854216 + -2

Combine like terms: 1.914854216 + -2 = -0.085145784
x = -0.085145784

Simplifying
x = -0.085145784


Subproblem 2
x + 2 = -1.914854216

Simplifying
x + 2 = -1.914854216

Reorder the terms:
2 + x = -1.914854216

Solving
2 + x = -1.914854216

Solving for variable 'x'.

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

Add '-2' to each side of the equation.
2 + -2 + x = -1.914854216 + -2

Combine like terms: 2 + -2 = 0
0 + x = -1.914854216 + -2
x = -1.914854216 + -2

Combine like terms: -1.914854216 + -2 = -3.914854216
x = -3.914854216

Simplifying
x = -3.914854216


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {-0.085145784, -3.914854216}
Solution
x = {-0.085145784, -3.914854216}

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