x^2-9x-2.5=0

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Solution for x^2-9x-2.5=0 equation: 


Simplifying
x2 + -9x + -2.5 = 0

Reorder the terms:
-2.5 + -9x + x2 = 0

Solving
-2.5 + -9x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -9x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -9x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -9x + x2 = 0 + 2.5
-9x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-9x + x2 = 2.5

The x term is -9x.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9x + 20.25 + x2 = 2.5 + 20.25

Reorder the terms:
20.25 + -9x + x2 = 2.5 + 20.25

Combine like terms: 2.5 + 20.25 = 22.75
20.25 + -9x + x2 = 22.75

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = 22.75

Calculate the square root of the right side: 4.769696007

Break this problem into two subproblems by setting 
(x + -4.5) equal to 4.769696007 and -4.769696007.


Subproblem 1
x + -4.5 = 4.769696007

Simplifying
x + -4.5 = 4.769696007

Reorder the terms:
-4.5 + x = 4.769696007

Solving
-4.5 + x = 4.769696007

Solving for variable 'x'.

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

Add '4.5' to each side of the equation.
-4.5 + 4.5 + x = 4.769696007 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + x = 4.769696007 + 4.5
x = 4.769696007 + 4.5

Combine like terms: 4.769696007 + 4.5 = 9.269696007
x = 9.269696007

Simplifying
x = 9.269696007


Subproblem 2
x + -4.5 = -4.769696007

Simplifying
x + -4.5 = -4.769696007

Reorder the terms:
-4.5 + x = -4.769696007

Solving
-4.5 + x = -4.769696007

Solving for variable 'x'.

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

Add '4.5' to each side of the equation.
-4.5 + 4.5 + x = -4.769696007 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + x = -4.769696007 + 4.5
x = -4.769696007 + 4.5

Combine like terms: -4.769696007 + 4.5 = -0.269696007
x = -0.269696007

Simplifying
x = -0.269696007


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {9.269696007, -0.269696007}

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