3x(x-8)=69

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Solution for 3x(x-8)=69 equation: 


Simplifying
3x(x + -8) = 69

Reorder the terms:
3x(-8 + x) = 69
(-8 * 3x + x * 3x) = 69
(-24x + 3x2) = 69

Solving
-24x + 3x2 = 69

Solving for variable 'x'.

Reorder the terms:
-69 + -24x + 3x2 = 69 + -69

Combine like terms: 69 + -69 = 0
-69 + -24x + 3x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-23 + -8x + x2) = 0

Ignore the factor 3.

Subproblem 1
Set the factor '(-23 + -8x + x2)' equal to zero and attempt to solve:

Simplifying
-23 + -8x + x2 = 0

Solving
-23 + -8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '23' to each side of the equation.
-23 + -8x + 23 + x2 = 0 + 23

Reorder the terms:
-23 + 23 + -8x + x2 = 0 + 23

Combine like terms: -23 + 23 = 0
0 + -8x + x2 = 0 + 23
-8x + x2 = 0 + 23

Combine like terms: 0 + 23 = 23
-8x + x2 = 23

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 23 + 16

Reorder the terms:
16 + -8x + x2 = 23 + 16

Combine like terms: 23 + 16 = 39
16 + -8x + x2 = 39

Factor a perfect square on the left side:
(x + -4)(x + -4) = 39

Calculate the square root of the right side: 6.244997998

Break this problem into two subproblems by setting 
(x + -4) equal to 6.244997998 and -6.244997998.


Subproblem 1
x + -4 = 6.244997998

Simplifying
x + -4 = 6.244997998

Reorder the terms:
-4 + x = 6.244997998

Solving
-4 + x = 6.244997998

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '4' to each side of the equation.
-4 + 4 + x = 6.244997998 + 4

Combine like terms: -4 + 4 = 0
0 + x = 6.244997998 + 4
x = 6.244997998 + 4

Combine like terms: 6.244997998 + 4 = 10.244997998
x = 10.244997998

Simplifying
x = 10.244997998


Subproblem 2
x + -4 = -6.244997998

Simplifying
x + -4 = -6.244997998

Reorder the terms:
-4 + x = -6.244997998

Solving
-4 + x = -6.244997998

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '4' to each side of the equation.
-4 + 4 + x = -6.244997998 + 4

Combine like terms: -4 + 4 = 0
0 + x = -6.244997998 + 4
x = -6.244997998 + 4

Combine like terms: -6.244997998 + 4 = -2.244997998
x = -2.244997998

Simplifying
x = -2.244997998


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {10.244997998, -2.244997998}
Solution
x = {10.244997998, -2.244997998}

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