x^2+17x+8.5=0

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Solution for x^2+17x+8.5=0 equation: 


Simplifying
x2 + 17x + 8.5 = 0

Reorder the terms:
8.5 + 17x + x2 = 0

Solving
8.5 + 17x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-8.5' to each side of the equation.
8.5 + 17x + -8.5 + x2 = 0 + -8.5

Reorder the terms:
8.5 + -8.5 + 17x + x2 = 0 + -8.5

Combine like terms: 8.5 + -8.5 = 0.0
0.0 + 17x + x2 = 0 + -8.5
17x + x2 = 0 + -8.5

Combine like terms: 0 + -8.5 = -8.5
17x + x2 = -8.5

The x term is 17x.  Take half its coefficient (8.5).
Square it (72.25) and add it to both sides.

Add '72.25' to each side of the equation.
17x + 72.25 + x2 = -8.5 + 72.25

Reorder the terms:
72.25 + 17x + x2 = -8.5 + 72.25

Combine like terms: -8.5 + 72.25 = 63.75
72.25 + 17x + x2 = 63.75

Factor a perfect square on the left side:
(x + 8.5)(x + 8.5) = 63.75

Calculate the square root of the right side: 7.984359711

Break this problem into two subproblems by setting 
(x + 8.5) equal to 7.984359711 and -7.984359711.


Subproblem 1
x + 8.5 = 7.984359711

Simplifying
x + 8.5 = 7.984359711

Reorder the terms:
8.5 + x = 7.984359711

Solving
8.5 + x = 7.984359711

Solving for variable 'x'.

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

Add '-8.5' to each side of the equation.
8.5 + -8.5 + x = 7.984359711 + -8.5

Combine like terms: 8.5 + -8.5 = 0.0
0.0 + x = 7.984359711 + -8.5
x = 7.984359711 + -8.5

Combine like terms: 7.984359711 + -8.5 = -0.515640289
x = -0.515640289

Simplifying
x = -0.515640289


Subproblem 2
x + 8.5 = -7.984359711

Simplifying
x + 8.5 = -7.984359711

Reorder the terms:
8.5 + x = -7.984359711

Solving
8.5 + x = -7.984359711

Solving for variable 'x'.

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

Add '-8.5' to each side of the equation.
8.5 + -8.5 + x = -7.984359711 + -8.5

Combine like terms: 8.5 + -8.5 = 0.0
0.0 + x = -7.984359711 + -8.5
x = -7.984359711 + -8.5

Combine like terms: -7.984359711 + -8.5 = -16.484359711
x = -16.484359711

Simplifying
x = -16.484359711


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {-0.515640289, -16.484359711}

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