(x+6)(x-3)=8

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Solution for (x+6)(x-3)=8 equation:


Simplifying
(x + 6)(x + -3) = 8

Reorder the terms:
(6 + x)(x + -3) = 8

Reorder the terms:
(6 + x)(-3 + x) = 8

Multiply (6 + x) * (-3 + x)
(6(-3 + x) + x(-3 + x)) = 8
((-3 * 6 + x * 6) + x(-3 + x)) = 8
((-18 + 6x) + x(-3 + x)) = 8
(-18 + 6x + (-3 * x + x * x)) = 8
(-18 + 6x + (-3x + x2)) = 8

Combine like terms: 6x + -3x = 3x
(-18 + 3x + x2) = 8

Solving
-18 + 3x + x2 = 8

Solving for variable 'x'.

Reorder the terms:
-18 + -8 + 3x + x2 = 8 + -8

Combine like terms: -18 + -8 = -26
-26 + 3x + x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-26 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '26' to each side of the equation.
-26 + 3x + 26 + x2 = 0 + 26

Reorder the terms:
-26 + 26 + 3x + x2 = 0 + 26

Combine like terms: -26 + 26 = 0
0 + 3x + x2 = 0 + 26
3x + x2 = 0 + 26

Combine like terms: 0 + 26 = 26
3x + x2 = 26

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 = 26 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 26 + 2.25

Combine like terms: 26 + 2.25 = 28.25
2.25 + 3x + x2 = 28.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 28.25

Calculate the square root of the right side: 5.315072906

Break this problem into two subproblems by setting 
(x + 1.5) equal to 5.315072906 and -5.315072906.

Subproblem 1

x + 1.5 = 5.315072906 Simplifying x + 1.5 = 5.315072906 Reorder the terms: 1.5 + x = 5.315072906 Solving 1.5 + x = 5.315072906 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 = 5.315072906 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 5.315072906 + -1.5 x = 5.315072906 + -1.5 Combine like terms: 5.315072906 + -1.5 = 3.815072906 x = 3.815072906 Simplifying x = 3.815072906

Subproblem 2

x + 1.5 = -5.315072906 Simplifying x + 1.5 = -5.315072906 Reorder the terms: 1.5 + x = -5.315072906 Solving 1.5 + x = -5.315072906 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 = -5.315072906 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -5.315072906 + -1.5 x = -5.315072906 + -1.5 Combine like terms: -5.315072906 + -1.5 = -6.815072906 x = -6.815072906 Simplifying x = -6.815072906

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.815072906, -6.815072906}

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