x^2-5x-40=0

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Solution for x^2-5x-40=0 equation: 


Simplifying
x2 + -5x + -40 = 0

Reorder the terms:
-40 + -5x + x2 = 0

Solving
-40 + -5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + -5x + 40 + x2 = 0 + 40

Reorder the terms:
-40 + 40 + -5x + x2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + -5x + x2 = 0 + 40
-5x + x2 = 0 + 40

Combine like terms: 0 + 40 = 40
-5x + x2 = 40

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 = 40 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 40 + 6.25

Combine like terms: 40 + 6.25 = 46.25
6.25 + -5x + x2 = 46.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 46.25

Calculate the square root of the right side: 6.800735254

Break this problem into two subproblems by setting 
(x + -2.5) equal to 6.800735254 and -6.800735254.


Subproblem 1
x + -2.5 = 6.800735254

Simplifying
x + -2.5 = 6.800735254

Reorder the terms:
-2.5 + x = 6.800735254

Solving
-2.5 + x = 6.800735254

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 = 6.800735254 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + x = 6.800735254 + 2.5
x = 6.800735254 + 2.5

Combine like terms: 6.800735254 + 2.5 = 9.300735254
x = 9.300735254

Simplifying
x = 9.300735254


Subproblem 2
x + -2.5 = -6.800735254

Simplifying
x + -2.5 = -6.800735254

Reorder the terms:
-2.5 + x = -6.800735254

Solving
-2.5 + x = -6.800735254

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 = -6.800735254 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + x = -6.800735254 + 2.5
x = -6.800735254 + 2.5

Combine like terms: -6.800735254 + 2.5 = -4.300735254
x = -4.300735254

Simplifying
x = -4.300735254


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {9.300735254, -4.300735254}

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