y^2+20y-100=0

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Solution for y^2+20y-100=0 equation: 


Simplifying
y2 + 20y + -100 = 0

Reorder the terms:
-100 + 20y + y2 = 0

Solving
-100 + 20y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + 20y + 100 + y2 = 0 + 100

Reorder the terms:
-100 + 100 + 20y + y2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + 20y + y2 = 0 + 100
20y + y2 = 0 + 100

Combine like terms: 0 + 100 = 100
20y + y2 = 100

The y term is 20y.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20y + 100 + y2 = 100 + 100

Reorder the terms:
100 + 20y + y2 = 100 + 100

Combine like terms: 100 + 100 = 200
100 + 20y + y2 = 200

Factor a perfect square on the left side:
(y + 10)(y + 10) = 200

Calculate the square root of the right side: 14.142135624

Break this problem into two subproblems by setting 
(y + 10) equal to 14.142135624 and -14.142135624.


Subproblem 1
y + 10 = 14.142135624

Simplifying
y + 10 = 14.142135624

Reorder the terms:
10 + y = 14.142135624

Solving
10 + y = 14.142135624

Solving for variable 'y'.

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

Add '-10' to each side of the equation.
10 + -10 + y = 14.142135624 + -10

Combine like terms: 10 + -10 = 0
0 + y = 14.142135624 + -10
y = 14.142135624 + -10

Combine like terms: 14.142135624 + -10 = 4.142135624
y = 4.142135624

Simplifying
y = 4.142135624


Subproblem 2
y + 10 = -14.142135624

Simplifying
y + 10 = -14.142135624

Reorder the terms:
10 + y = -14.142135624

Solving
10 + y = -14.142135624

Solving for variable 'y'.

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

Add '-10' to each side of the equation.
10 + -10 + y = -14.142135624 + -10

Combine like terms: 10 + -10 = 0
0 + y = -14.142135624 + -10
y = -14.142135624 + -10

Combine like terms: -14.142135624 + -10 = -24.142135624
y = -24.142135624

Simplifying
y = -24.142135624


Solution
The solution to the problem is based on the solutions
from the subproblems.
y = {4.142135624, -24.142135624}

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