y^2+20=10y

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Solution for y^2+20=10y equation:


Simplifying
y2 + 20 = 10y

Reorder the terms:
20 + y2 = 10y

Solving
20 + y2 = 10y

Solving for variable 'y'.

Reorder the terms:
20 + -10y + y2 = 10y + -10y

Combine like terms: 10y + -10y = 0
20 + -10y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-20' to each side of the equation.
20 + -10y + -20 + y2 = 0 + -20

Reorder the terms:
20 + -20 + -10y + y2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + -10y + y2 = 0 + -20
-10y + y2 = 0 + -20

Combine like terms: 0 + -20 = -20
-10y + y2 = -20

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

Add '25' to each side of the equation.
-10y + 25 + y2 = -20 + 25

Reorder the terms:
25 + -10y + y2 = -20 + 25

Combine like terms: -20 + 25 = 5
25 + -10y + y2 = 5

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

Calculate the square root of the right side: 2.236067978

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

Subproblem 1

y + -5 = 2.236067978 Simplifying y + -5 = 2.236067978 Reorder the terms: -5 + y = 2.236067978 Solving -5 + y = 2.236067978 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + y = 2.236067978 + 5 Combine like terms: -5 + 5 = 0 0 + y = 2.236067978 + 5 y = 2.236067978 + 5 Combine like terms: 2.236067978 + 5 = 7.236067978 y = 7.236067978 Simplifying y = 7.236067978

Subproblem 2

y + -5 = -2.236067978 Simplifying y + -5 = -2.236067978 Reorder the terms: -5 + y = -2.236067978 Solving -5 + y = -2.236067978 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + y = -2.236067978 + 5 Combine like terms: -5 + 5 = 0 0 + y = -2.236067978 + 5 y = -2.236067978 + 5 Combine like terms: -2.236067978 + 5 = 2.763932022 y = 2.763932022 Simplifying y = 2.763932022

Solution

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

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