.5(x+6)(x+3)=119

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Solution for .5(x+6)(x+3)=119 equation:


Simplifying
0.5(x + 6)(x + 3) = 119

Reorder the terms:
0.5(6 + x)(x + 3) = 119

Reorder the terms:
0.5(6 + x)(3 + x) = 119

Multiply (6 + x) * (3 + x)
0.5(6(3 + x) + x(3 + x)) = 119
0.5((3 * 6 + x * 6) + x(3 + x)) = 119
0.5((18 + 6x) + x(3 + x)) = 119
0.5(18 + 6x + (3 * x + x * x)) = 119
0.5(18 + 6x + (3x + x2)) = 119

Combine like terms: 6x + 3x = 9x
0.5(18 + 9x + x2) = 119
(18 * 0.5 + 9x * 0.5 + x2 * 0.5) = 119
(9 + 4.5x + 0.5x2) = 119

Solving
9 + 4.5x + 0.5x2 = 119

Solving for variable 'x'.

Reorder the terms:
9 + -119 + 4.5x + 0.5x2 = 119 + -119

Combine like terms: 9 + -119 = -110
-110 + 4.5x + 0.5x2 = 119 + -119

Combine like terms: 119 + -119 = 0
-110 + 4.5x + 0.5x2 = 0

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

Divide each side by '0.5'.
-220 + 9x + x2 = 0

Move the constant term to the right:

Add '220' to each side of the equation.
-220 + 9x + 220 + x2 = 0 + 220

Reorder the terms:
-220 + 220 + 9x + x2 = 0 + 220

Combine like terms: -220 + 220 = 0
0 + 9x + x2 = 0 + 220
9x + x2 = 0 + 220

Combine like terms: 0 + 220 = 220
9x + x2 = 220

The x term is 9x.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9x + 20.25 + x2 = 220 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 220 + 20.25

Combine like terms: 220 + 20.25 = 240.25
20.25 + 9x + x2 = 240.25

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 240.25

Calculate the square root of the right side: 15.5

Break this problem into two subproblems by setting 
(x + 4.5) equal to 15.5 and -15.5.

Subproblem 1

x + 4.5 = 15.5 Simplifying x + 4.5 = 15.5 Reorder the terms: 4.5 + x = 15.5 Solving 4.5 + x = 15.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = 15.5 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 15.5 + -4.5 x = 15.5 + -4.5 Combine like terms: 15.5 + -4.5 = 11 x = 11 Simplifying x = 11

Subproblem 2

x + 4.5 = -15.5 Simplifying x + 4.5 = -15.5 Reorder the terms: 4.5 + x = -15.5 Solving 4.5 + x = -15.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = -15.5 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -15.5 + -4.5 x = -15.5 + -4.5 Combine like terms: -15.5 + -4.5 = -20 x = -20 Simplifying x = -20

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11, -20}

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