x^2-5x-72=-4

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Solution for x^2-5x-72=-4 equation:


Simplifying
x2 + -5x + -72 = -4

Reorder the terms:
-72 + -5x + x2 = -4

Solving
-72 + -5x + x2 = -4

Solving for variable 'x'.

Reorder the terms:
-72 + 4 + -5x + x2 = -4 + 4

Combine like terms: -72 + 4 = -68
-68 + -5x + x2 = -4 + 4

Combine like terms: -4 + 4 = 0
-68 + -5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '68' to each side of the equation.
-68 + -5x + 68 + x2 = 0 + 68

Reorder the terms:
-68 + 68 + -5x + x2 = 0 + 68

Combine like terms: -68 + 68 = 0
0 + -5x + x2 = 0 + 68
-5x + x2 = 0 + 68

Combine like terms: 0 + 68 = 68
-5x + x2 = 68

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 68 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 68 + 6.25

Combine like terms: 68 + 6.25 = 74.25
6.25 + -5x + x2 = 74.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 74.25

Calculate the square root of the right side: 8.61684397

Break this problem into two subproblems by setting 
(x + -2.5) equal to 8.61684397 and -8.61684397.


Subproblem 1
x + -2.5 = 8.61684397

Simplifying
x + -2.5 = 8.61684397

Reorder the terms:
-2.5 + x = 8.61684397

Solving
-2.5 + x = 8.61684397

Solving for variable 'x'.

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

Add '2.5' to each side of the equation.
-2.5 + 2.5 + x = 8.61684397 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + x = 8.61684397 + 2.5
x = 8.61684397 + 2.5

Combine like terms: 8.61684397 + 2.5 = 11.11684397
x = 11.11684397

Simplifying
x = 11.11684397


Subproblem 2
x + -2.5 = -8.61684397

Simplifying
x + -2.5 = -8.61684397

Reorder the terms:
-2.5 + x = -8.61684397

Solving
-2.5 + x = -8.61684397

Solving for variable 'x'.

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

Add '2.5' to each side of the equation.
-2.5 + 2.5 + x = -8.61684397 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + x = -8.61684397 + 2.5
x = -8.61684397 + 2.5

Combine like terms: -8.61684397 + 2.5 = -6.11684397
x = -6.11684397

Simplifying
x = -6.11684397


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {11.11684397, -6.11684397}

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