-x^2-10x-20=0

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Solution for -x^2-10x-20=0 equation: 


Simplifying
-1x2 + -10x + -20 = 0

Reorder the terms:
-20 + -10x + -1x2 = 0

Solving
-20 + -10x + -1x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '-1'.
-1(20 + 10x + x2) = 0

Ignore the factor -1.

Subproblem 1
Set the factor '(20 + 10x + x2)' equal to zero and attempt to solve:

Simplifying
20 + 10x + x2 = 0

Solving
20 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-20' to each side of the equation.
20 + 10x + -20 + x2 = 0 + -20

Reorder the terms:
20 + -20 + 10x + x2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + 10x + x2 = 0 + -20
10x + x2 = 0 + -20

Combine like terms: 0 + -20 = -20
10x + x2 = -20

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = -20 + 25

Reorder the terms:
25 + 10x + x2 = -20 + 25

Combine like terms: -20 + 25 = 5
25 + 10x + x2 = 5

Factor a perfect square on the left side:
(x + 5)(x + 5) = 5

Calculate the square root of the right side: 2.236067978

Break this problem into two subproblems by setting 
(x + 5) equal to 2.236067978 and -2.236067978.


Subproblem 1
x + 5 = 2.236067978

Simplifying
x + 5 = 2.236067978

Reorder the terms:
5 + x = 2.236067978

Solving
5 + x = 2.236067978

Solving for variable 'x'.

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

Add '-5' to each side of the equation.
5 + -5 + x = 2.236067978 + -5

Combine like terms: 5 + -5 = 0
0 + x = 2.236067978 + -5
x = 2.236067978 + -5

Combine like terms: 2.236067978 + -5 = -2.763932022
x = -2.763932022

Simplifying
x = -2.763932022


Subproblem 2
x + 5 = -2.236067978

Simplifying
x + 5 = -2.236067978

Reorder the terms:
5 + x = -2.236067978

Solving
5 + x = -2.236067978

Solving for variable 'x'.

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

Add '-5' to each side of the equation.
5 + -5 + x = -2.236067978 + -5

Combine like terms: 5 + -5 = 0
0 + x = -2.236067978 + -5
x = -2.236067978 + -5

Combine like terms: -2.236067978 + -5 = -7.236067978
x = -7.236067978

Simplifying
x = -7.236067978


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {-2.763932022, -7.236067978}
Solution
x = {-2.763932022, -7.236067978}

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