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

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


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

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

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

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

Combine like terms: -3x + 6x = 3x
(-18 + 3x + x2) = 9

Solving
-18 + 3x + x2 = 9

Solving for variable 'x'.

Reorder the terms:
-18 + -9 + 3x + x2 = 9 + -9

Combine like terms: -18 + -9 = -27
-27 + 3x + x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-27 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '27' to each side of the equation.
-27 + 3x + 27 + x2 = 0 + 27

Reorder the terms:
-27 + 27 + 3x + x2 = 0 + 27

Combine like terms: -27 + 27 = 0
0 + 3x + x2 = 0 + 27
3x + x2 = 0 + 27

Combine like terms: 0 + 27 = 27
3x + x2 = 27

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 27 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 27 + 2.25

Combine like terms: 27 + 2.25 = 29.25
2.25 + 3x + x2 = 29.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 29.25

Calculate the square root of the right side: 5.408326913

Break this problem into two subproblems by setting 
(x + 1.5) equal to 5.408326913 and -5.408326913.

Subproblem 1

x + 1.5 = 5.408326913 Simplifying x + 1.5 = 5.408326913 Reorder the terms: 1.5 + x = 5.408326913 Solving 1.5 + x = 5.408326913 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 5.408326913 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 5.408326913 + -1.5 x = 5.408326913 + -1.5 Combine like terms: 5.408326913 + -1.5 = 3.908326913 x = 3.908326913 Simplifying x = 3.908326913

Subproblem 2

x + 1.5 = -5.408326913 Simplifying x + 1.5 = -5.408326913 Reorder the terms: 1.5 + x = -5.408326913 Solving 1.5 + x = -5.408326913 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -5.408326913 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -5.408326913 + -1.5 x = -5.408326913 + -1.5 Combine like terms: -5.408326913 + -1.5 = -6.908326913 x = -6.908326913 Simplifying x = -6.908326913

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.908326913, -6.908326913}

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