120=0.5(x+4)(3x+6)

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Solution for 120=0.5(x+4)(3x+6) equation:


Simplifying
120 = 0.5(x + 4)(3x + 6)

Reorder the terms:
120 = 0.5(4 + x)(3x + 6)

Reorder the terms:
120 = 0.5(4 + x)(6 + 3x)

Multiply (4 + x) * (6 + 3x)
120 = 0.5(4(6 + 3x) + x(6 + 3x))
120 = 0.5((6 * 4 + 3x * 4) + x(6 + 3x))
120 = 0.5((24 + 12x) + x(6 + 3x))
120 = 0.5(24 + 12x + (6 * x + 3x * x))
120 = 0.5(24 + 12x + (6x + 3x2))

Combine like terms: 12x + 6x = 18x
120 = 0.5(24 + 18x + 3x2)
120 = (24 * 0.5 + 18x * 0.5 + 3x2 * 0.5)
120 = (12 + 9x + 1.5x2)

Solving
120 = 12 + 9x + 1.5x2

Solving for variable 'x'.

Combine like terms: 120 + -12 = 108
108 + -9x + -1.5x2 = 12 + 9x + 1.5x2 + -12 + -9x + -1.5x2

Reorder the terms:
108 + -9x + -1.5x2 = 12 + -12 + 9x + -9x + 1.5x2 + -1.5x2

Combine like terms: 12 + -12 = 0
108 + -9x + -1.5x2 = 0 + 9x + -9x + 1.5x2 + -1.5x2
108 + -9x + -1.5x2 = 9x + -9x + 1.5x2 + -1.5x2

Combine like terms: 9x + -9x = 0
108 + -9x + -1.5x2 = 0 + 1.5x2 + -1.5x2
108 + -9x + -1.5x2 = 1.5x2 + -1.5x2

Combine like terms: 1.5x2 + -1.5x2 = 0.0
108 + -9x + -1.5x2 = 0.0

Begin completing the square.  Divide all terms by
-1.5 the coefficient of the squared term: 

Divide each side by '-1.5'.
-72 + 6x + x2 = 0

Move the constant term to the right:

Add '72' to each side of the equation.
-72 + 6x + 72 + x2 = 0 + 72

Reorder the terms:
-72 + 72 + 6x + x2 = 0 + 72

Combine like terms: -72 + 72 = 0
0 + 6x + x2 = 0 + 72
6x + x2 = 0 + 72

Combine like terms: 0 + 72 = 72
6x + x2 = 72

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 72 + 9

Reorder the terms:
9 + 6x + x2 = 72 + 9

Combine like terms: 72 + 9 = 81
9 + 6x + x2 = 81

Factor a perfect square on the left side:
(x + 3)(x + 3) = 81

Calculate the square root of the right side: 9

Break this problem into two subproblems by setting 
(x + 3) equal to 9 and -9.

Subproblem 1

x + 3 = 9 Simplifying x + 3 = 9 Reorder the terms: 3 + x = 9 Solving 3 + x = 9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 9 + -3 Combine like terms: 3 + -3 = 0 0 + x = 9 + -3 x = 9 + -3 Combine like terms: 9 + -3 = 6 x = 6 Simplifying x = 6

Subproblem 2

x + 3 = -9 Simplifying x + 3 = -9 Reorder the terms: 3 + x = -9 Solving 3 + x = -9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -9 + -3 Combine like terms: 3 + -3 = 0 0 + x = -9 + -3 x = -9 + -3 Combine like terms: -9 + -3 = -12 x = -12 Simplifying x = -12

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6, -12}

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