60=0.5(x+5)(3x+6)

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Solution for 60=0.5(x+5)(3x+6) equation:


Simplifying
60 = 0.5(x + 5)(3x + 6)

Reorder the terms:
60 = 0.5(5 + x)(3x + 6)

Reorder the terms:
60 = 0.5(5 + x)(6 + 3x)

Multiply (5 + x) * (6 + 3x)
60 = 0.5(5(6 + 3x) + x(6 + 3x))
60 = 0.5((6 * 5 + 3x * 5) + x(6 + 3x))
60 = 0.5((30 + 15x) + x(6 + 3x))
60 = 0.5(30 + 15x + (6 * x + 3x * x))
60 = 0.5(30 + 15x + (6x + 3x2))

Combine like terms: 15x + 6x = 21x
60 = 0.5(30 + 21x + 3x2)
60 = (30 * 0.5 + 21x * 0.5 + 3x2 * 0.5)
60 = (15 + 10.5x + 1.5x2)

Solving
60 = 15 + 10.5x + 1.5x2

Solving for variable 'x'.

Combine like terms: 60 + -15 = 45
45 + -10.5x + -1.5x2 = 15 + 10.5x + 1.5x2 + -15 + -10.5x + -1.5x2

Reorder the terms:
45 + -10.5x + -1.5x2 = 15 + -15 + 10.5x + -10.5x + 1.5x2 + -1.5x2

Combine like terms: 15 + -15 = 0
45 + -10.5x + -1.5x2 = 0 + 10.5x + -10.5x + 1.5x2 + -1.5x2
45 + -10.5x + -1.5x2 = 10.5x + -10.5x + 1.5x2 + -1.5x2

Combine like terms: 10.5x + -10.5x = 0.0
45 + -10.5x + -1.5x2 = 0.0 + 1.5x2 + -1.5x2
45 + -10.5x + -1.5x2 = 1.5x2 + -1.5x2

Combine like terms: 1.5x2 + -1.5x2 = 0.0
45 + -10.5x + -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'.
-30 + 7x + x2 = 0

Move the constant term to the right:

Add '30' to each side of the equation.
-30 + 7x + 30 + x2 = 0 + 30

Reorder the terms:
-30 + 30 + 7x + x2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + 7x + x2 = 0 + 30
7x + x2 = 0 + 30

Combine like terms: 0 + 30 = 30
7x + x2 = 30

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = 30 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 30 + 12.25

Combine like terms: 30 + 12.25 = 42.25
12.25 + 7x + x2 = 42.25

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 42.25

Calculate the square root of the right side: 6.5

Break this problem into two subproblems by setting 
(x + 3.5) equal to 6.5 and -6.5.

Subproblem 1

x + 3.5 = 6.5 Simplifying x + 3.5 = 6.5 Reorder the terms: 3.5 + x = 6.5 Solving 3.5 + x = 6.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 6.5 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 6.5 + -3.5 x = 6.5 + -3.5 Combine like terms: 6.5 + -3.5 = 3 x = 3 Simplifying x = 3

Subproblem 2

x + 3.5 = -6.5 Simplifying x + 3.5 = -6.5 Reorder the terms: 3.5 + x = -6.5 Solving 3.5 + x = -6.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -6.5 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -6.5 + -3.5 x = -6.5 + -3.5 Combine like terms: -6.5 + -3.5 = -10 x = -10 Simplifying x = -10

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3, -10}

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