x^2+4.5x-9=0

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Solution for x^2+4.5x-9=0 equation: 


Simplifying
x2 + 4.5x + -9 = 0

Reorder the terms:
-9 + 4.5x + x2 = 0

Solving
-9 + 4.5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 4.5x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + 4.5x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 4.5x + x2 = 0 + 9
4.5x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
4.5x + x2 = 9

The x term is 4.5x.  Take half its coefficient (2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
4.5x + 5.0625 + x2 = 9 + 5.0625

Reorder the terms:
5.0625 + 4.5x + x2 = 9 + 5.0625

Combine like terms: 9 + 5.0625 = 14.0625
5.0625 + 4.5x + x2 = 14.0625

Factor a perfect square on the left side:
(x + 2.25)(x + 2.25) = 14.0625

Calculate the square root of the right side: 3.75

Break this problem into two subproblems by setting 
(x + 2.25) equal to 3.75 and -3.75.


Subproblem 1
x + 2.25 = 3.75

Simplifying
x + 2.25 = 3.75

Reorder the terms:
2.25 + x = 3.75

Solving
2.25 + x = 3.75

Solving for variable 'x'.

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

Add '-2.25' to each side of the equation.
2.25 + -2.25 + x = 3.75 + -2.25

Combine like terms: 2.25 + -2.25 = 0.00
0.00 + x = 3.75 + -2.25
x = 3.75 + -2.25

Combine like terms: 3.75 + -2.25 = 1.5
x = 1.5

Simplifying
x = 1.5


Subproblem 2
x + 2.25 = -3.75

Simplifying
x + 2.25 = -3.75

Reorder the terms:
2.25 + x = -3.75

Solving
2.25 + x = -3.75

Solving for variable 'x'.

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

Add '-2.25' to each side of the equation.
2.25 + -2.25 + x = -3.75 + -2.25

Combine like terms: 2.25 + -2.25 = 0.00
0.00 + x = -3.75 + -2.25
x = -3.75 + -2.25

Combine like terms: -3.75 + -2.25 = -6
x = -6

Simplifying
x = -6


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {1.5, -6}

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