2x^2-8x-72=0

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Solution for 2x^2-8x-72=0 equation: 


Simplifying
2x2 + -8x + -72 = 0

Reorder the terms:
-72 + -8x + 2x2 = 0

Solving
-72 + -8x + 2x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-36 + -4x + x2) = 0

Ignore the factor 2.

Subproblem 1
Set the factor '(-36 + -4x + x2)' equal to zero and attempt to solve:

Simplifying
-36 + -4x + x2 = 0

Solving
-36 + -4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + -4x + 36 + x2 = 0 + 36

Reorder the terms:
-36 + 36 + -4x + x2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + -4x + x2 = 0 + 36
-4x + x2 = 0 + 36

Combine like terms: 0 + 36 = 36
-4x + x2 = 36

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 36 + 4

Reorder the terms:
4 + -4x + x2 = 36 + 4

Combine like terms: 36 + 4 = 40
4 + -4x + x2 = 40

Factor a perfect square on the left side:
(x + -2)(x + -2) = 40

Calculate the square root of the right side: 6.32455532

Break this problem into two subproblems by setting 
(x + -2) equal to 6.32455532 and -6.32455532.


Subproblem 1
x + -2 = 6.32455532

Simplifying
x + -2 = 6.32455532

Reorder the terms:
-2 + x = 6.32455532

Solving
-2 + x = 6.32455532

Solving for variable 'x'.

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

Add '2' to each side of the equation.
-2 + 2 + x = 6.32455532 + 2

Combine like terms: -2 + 2 = 0
0 + x = 6.32455532 + 2
x = 6.32455532 + 2

Combine like terms: 6.32455532 + 2 = 8.32455532
x = 8.32455532

Simplifying
x = 8.32455532


Subproblem 2
x + -2 = -6.32455532

Simplifying
x + -2 = -6.32455532

Reorder the terms:
-2 + x = -6.32455532

Solving
-2 + x = -6.32455532

Solving for variable 'x'.

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

Add '2' to each side of the equation.
-2 + 2 + x = -6.32455532 + 2

Combine like terms: -2 + 2 = 0
0 + x = -6.32455532 + 2
x = -6.32455532 + 2

Combine like terms: -6.32455532 + 2 = -4.32455532
x = -4.32455532

Simplifying
x = -4.32455532


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {8.32455532, -4.32455532}
Solution
x = {8.32455532, -4.32455532}

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