(3x-2)(x+6)=-9

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Solution for (3x-2)(x+6)=-9 equation:


Simplifying
(3x + -2)(x + 6) = -9

Reorder the terms:
(-2 + 3x)(x + 6) = -9

Reorder the terms:
(-2 + 3x)(6 + x) = -9

Multiply (-2 + 3x) * (6 + x)
(-2(6 + x) + 3x * (6 + x)) = -9
((6 * -2 + x * -2) + 3x * (6 + x)) = -9
((-12 + -2x) + 3x * (6 + x)) = -9
(-12 + -2x + (6 * 3x + x * 3x)) = -9
(-12 + -2x + (18x + 3x2)) = -9

Combine like terms: -2x + 18x = 16x
(-12 + 16x + 3x2) = -9

Solving
-12 + 16x + 3x2 = -9

Solving for variable 'x'.

Reorder the terms:
-12 + 9 + 16x + 3x2 = -9 + 9

Combine like terms: -12 + 9 = -3
-3 + 16x + 3x2 = -9 + 9

Combine like terms: -9 + 9 = 0
-3 + 16x + 3x2 = 0

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

Divide each side by '3'.
-1 + 5.333333333x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 5.333333333x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + 5.333333333x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 5.333333333x + x2 = 0 + 1
5.333333333x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
5.333333333x + x2 = 1

The x term is 5.333333333x.  Take half its coefficient (2.666666667).
Square it (7.111111113) and add it to both sides.

Add '7.111111113' to each side of the equation.
5.333333333x + 7.111111113 + x2 = 1 + 7.111111113

Reorder the terms:
7.111111113 + 5.333333333x + x2 = 1 + 7.111111113

Combine like terms: 1 + 7.111111113 = 8.111111113
7.111111113 + 5.333333333x + x2 = 8.111111113

Factor a perfect square on the left side:
(x + 2.666666667)(x + 2.666666667) = 8.111111113

Calculate the square root of the right side: 2.848001249

Break this problem into two subproblems by setting 
(x + 2.666666667) equal to 2.848001249 and -2.848001249.

Subproblem 1

x + 2.666666667 = 2.848001249 Simplifying x + 2.666666667 = 2.848001249 Reorder the terms: 2.666666667 + x = 2.848001249 Solving 2.666666667 + x = 2.848001249 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.666666667' to each side of the equation. 2.666666667 + -2.666666667 + x = 2.848001249 + -2.666666667 Combine like terms: 2.666666667 + -2.666666667 = 0.000000000 0.000000000 + x = 2.848001249 + -2.666666667 x = 2.848001249 + -2.666666667 Combine like terms: 2.848001249 + -2.666666667 = 0.181334582 x = 0.181334582 Simplifying x = 0.181334582

Subproblem 2

x + 2.666666667 = -2.848001249 Simplifying x + 2.666666667 = -2.848001249 Reorder the terms: 2.666666667 + x = -2.848001249 Solving 2.666666667 + x = -2.848001249 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.666666667' to each side of the equation. 2.666666667 + -2.666666667 + x = -2.848001249 + -2.666666667 Combine like terms: 2.666666667 + -2.666666667 = 0.000000000 0.000000000 + x = -2.848001249 + -2.666666667 x = -2.848001249 + -2.666666667 Combine like terms: -2.848001249 + -2.666666667 = -5.514667916 x = -5.514667916 Simplifying x = -5.514667916

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.181334582, -5.514667916}

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