y^2+20*y-200=0

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Solution for y^2+20*y-200=0 equation:


Simplifying
y2 + 20y + -200 = 0

Reorder the terms:
-200 + 20y + y2 = 0

Solving
-200 + 20y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '200' to each side of the equation.
-200 + 20y + 200 + y2 = 0 + 200

Reorder the terms:
-200 + 200 + 20y + y2 = 0 + 200

Combine like terms: -200 + 200 = 0
0 + 20y + y2 = 0 + 200
20y + y2 = 0 + 200

Combine like terms: 0 + 200 = 200
20y + y2 = 200

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 = 200 + 100

Reorder the terms:
100 + 20y + y2 = 200 + 100

Combine like terms: 200 + 100 = 300
100 + 20y + y2 = 300

Factor a perfect square on the left side:
(y + 10)(y + 10) = 300

Calculate the square root of the right side: 17.320508076

Break this problem into two subproblems by setting 
(y + 10) equal to 17.320508076 and -17.320508076.

Subproblem 1

y + 10 = 17.320508076 Simplifying y + 10 = 17.320508076 Reorder the terms: 10 + y = 17.320508076 Solving 10 + y = 17.320508076 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 = 17.320508076 + -10 Combine like terms: 10 + -10 = 0 0 + y = 17.320508076 + -10 y = 17.320508076 + -10 Combine like terms: 17.320508076 + -10 = 7.320508076 y = 7.320508076 Simplifying y = 7.320508076

Subproblem 2

y + 10 = -17.320508076 Simplifying y + 10 = -17.320508076 Reorder the terms: 10 + y = -17.320508076 Solving 10 + y = -17.320508076 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 = -17.320508076 + -10 Combine like terms: 10 + -10 = 0 0 + y = -17.320508076 + -10 y = -17.320508076 + -10 Combine like terms: -17.320508076 + -10 = -27.320508076 y = -27.320508076 Simplifying y = -27.320508076

Solution

The solution to the problem is based on the solutions from the subproblems. y = {7.320508076, -27.320508076}

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