72=0.5(3x+6)(x+4)

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Solution for 72=0.5(3x+6)(x+4) equation:


Simplifying
72 = 0.5(3x + 6)(x + 4)

Reorder the terms:
72 = 0.5(6 + 3x)(x + 4)

Reorder the terms:
72 = 0.5(6 + 3x)(4 + x)

Multiply (6 + 3x) * (4 + x)
72 = 0.5(6(4 + x) + 3x * (4 + x))
72 = 0.5((4 * 6 + x * 6) + 3x * (4 + x))
72 = 0.5((24 + 6x) + 3x * (4 + x))
72 = 0.5(24 + 6x + (4 * 3x + x * 3x))
72 = 0.5(24 + 6x + (12x + 3x2))

Combine like terms: 6x + 12x = 18x
72 = 0.5(24 + 18x + 3x2)
72 = (24 * 0.5 + 18x * 0.5 + 3x2 * 0.5)
72 = (12 + 9x + 1.5x2)

Solving
72 = 12 + 9x + 1.5x2

Solving for variable 'x'.

Combine like terms: 72 + -12 = 60
60 + -9x + -1.5x2 = 12 + 9x + 1.5x2 + -12 + -9x + -1.5x2

Reorder the terms:
60 + -9x + -1.5x2 = 12 + -12 + 9x + -9x + 1.5x2 + -1.5x2

Combine like terms: 12 + -12 = 0
60 + -9x + -1.5x2 = 0 + 9x + -9x + 1.5x2 + -1.5x2
60 + -9x + -1.5x2 = 9x + -9x + 1.5x2 + -1.5x2

Combine like terms: 9x + -9x = 0
60 + -9x + -1.5x2 = 0 + 1.5x2 + -1.5x2
60 + -9x + -1.5x2 = 1.5x2 + -1.5x2

Combine like terms: 1.5x2 + -1.5x2 = 0.0
60 + -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'.
-40 + 6x + x2 = 0

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + 6x + 40 + x2 = 0 + 40

Reorder the terms:
-40 + 40 + 6x + x2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + 6x + x2 = 0 + 40
6x + x2 = 0 + 40

Combine like terms: 0 + 40 = 40
6x + x2 = 40

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 = 40 + 9

Reorder the terms:
9 + 6x + x2 = 40 + 9

Combine like terms: 40 + 9 = 49
9 + 6x + x2 = 49

Factor a perfect square on the left side:
(x + 3)(x + 3) = 49

Calculate the square root of the right side: 7

Break this problem into two subproblems by setting 
(x + 3) equal to 7 and -7.

Subproblem 1

x + 3 = 7 Simplifying x + 3 = 7 Reorder the terms: 3 + x = 7 Solving 3 + x = 7 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 = 7 + -3 Combine like terms: 3 + -3 = 0 0 + x = 7 + -3 x = 7 + -3 Combine like terms: 7 + -3 = 4 x = 4 Simplifying x = 4

Subproblem 2

x + 3 = -7 Simplifying x + 3 = -7 Reorder the terms: 3 + x = -7 Solving 3 + x = -7 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 = -7 + -3 Combine like terms: 3 + -3 = 0 0 + x = -7 + -3 x = -7 + -3 Combine like terms: -7 + -3 = -10 x = -10 Simplifying x = -10

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4, -10}

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