X*X+8X+9=0

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Solution for X*X+8X+9=0 equation: 


Simplifying
X * X + 8X + 9 = 0

Multiply X * X
X2 + 8X + 9 = 0

Reorder the terms:
9 + 8X + X2 = 0

Solving
9 + 8X + 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 + 8X + -9 + X2 = 0 + -9

Reorder the terms:
9 + -9 + 8X + X2 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + 8X + X2 = 0 + -9
8X + X2 = 0 + -9

Combine like terms: 0 + -9 = -9
8X + X2 = -9

The X term is 8X.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8X + 16 + X2 = -9 + 16

Reorder the terms:
16 + 8X + X2 = -9 + 16

Combine like terms: -9 + 16 = 7
16 + 8X + X2 = 7

Factor a perfect square on the left side:
(X + 4)(X + 4) = 7

Calculate the square root of the right side: 2.645751311

Break this problem into two subproblems by setting 
(X + 4) equal to 2.645751311 and -2.645751311.


Subproblem 1
X + 4 = 2.645751311

Simplifying
X + 4 = 2.645751311

Reorder the terms:
4 + X = 2.645751311

Solving
4 + X = 2.645751311

Solving for variable 'X'.

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

Add '-4' to each side of the equation.
4 + -4 + X = 2.645751311 + -4

Combine like terms: 4 + -4 = 0
0 + X = 2.645751311 + -4
X = 2.645751311 + -4

Combine like terms: 2.645751311 + -4 = -1.354248689
X = -1.354248689

Simplifying
X = -1.354248689


Subproblem 2
X + 4 = -2.645751311

Simplifying
X + 4 = -2.645751311

Reorder the terms:
4 + X = -2.645751311

Solving
4 + X = -2.645751311

Solving for variable 'X'.

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

Add '-4' to each side of the equation.
4 + -4 + X = -2.645751311 + -4

Combine like terms: 4 + -4 = 0
0 + X = -2.645751311 + -4
X = -2.645751311 + -4

Combine like terms: -2.645751311 + -4 = -6.645751311
X = -6.645751311

Simplifying
X = -6.645751311


Solution
The solution to the problem is based on the solutions
from the subproblems.
X = {-1.354248689, -6.645751311}

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