3x(x+4)=3(x-1)

Solution for 3x(x+4)=3(x-1) equation:

Simplifying
3x(x + 4) = 3(x + -1)

Reorder the terms:
3x(4 + x) = 3(x + -1)
(4 * 3x + x * 3x) = 3(x + -1)
(12x + 3x2) = 3(x + -1)

Reorder the terms:
12x + 3x2 = 3(-1 + x)
12x + 3x2 = (-1 * 3 + x * 3)
12x + 3x2 = (-3 + 3x)

Solving
12x + 3x2 = -3 + 3x

Solving for variable 'x'.

Reorder the terms:
3 + 12x + -3x + 3x2 = -3 + 3x + 3 + -3x

Combine like terms: 12x + -3x = 9x
3 + 9x + 3x2 = -3 + 3x + 3 + -3x

Reorder the terms:
3 + 9x + 3x2 = -3 + 3 + 3x + -3x

Combine like terms: -3 + 3 = 0
3 + 9x + 3x2 = 0 + 3x + -3x
3 + 9x + 3x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
3 + 9x + 3x2 = 0

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

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

Simplifying
1 + 3x + x2 = 0

Solving
1 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + 3x + -1 + x2 = 0 + -1

Reorder the terms:
1 + -1 + 3x + x2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 3x + x2 = 0 + -1
3x + x2 = 0 + -1

Combine like terms: 0 + -1 = -1
3x + x2 = -1

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = -1 + 2.25

Reorder the terms:
2.25 + 3x + x2 = -1 + 2.25

Combine like terms: -1 + 2.25 = 1.25
2.25 + 3x + x2 = 1.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 1.25

Calculate the square root of the right side: 1.118033989

Break this problem into two subproblems by setting 
(x + 1.5) equal to 1.118033989 and -1.118033989.

Subproblem 1
x + 1.5 = 1.118033989

Simplifying
x + 1.5 = 1.118033989

Reorder the terms:
1.5 + x = 1.118033989

Solving
1.5 + x = 1.118033989

Solving for variable 'x'.

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

Add '-1.5' to each side of the equation.
1.5 + -1.5 + x = 1.118033989 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + x = 1.118033989 + -1.5
x = 1.118033989 + -1.5

Combine like terms: 1.118033989 + -1.5 = -0.381966011
x = -0.381966011

Simplifying
x = -0.381966011

Subproblem 2
x + 1.5 = -1.118033989

Simplifying
x + 1.5 = -1.118033989

Reorder the terms:
1.5 + x = -1.118033989

Solving
1.5 + x = -1.118033989

Solving for variable 'x'.

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

Add '-1.5' to each side of the equation.
1.5 + -1.5 + x = -1.118033989 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + x = -1.118033989 + -1.5
x = -1.118033989 + -1.5

Combine like terms: -1.118033989 + -1.5 = -2.618033989
x = -2.618033989

Simplifying
x = -2.618033989

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {-0.381966011, -2.618033989}
Solution
x = {-0.381966011, -2.618033989}