(y-5)(y-5)=20

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Solution for (y-5)(y-5)=20 equation:


Simplifying
(y + -5)(y + -5) = 20

Reorder the terms:
(-5 + y)(y + -5) = 20

Reorder the terms:
(-5 + y)(-5 + y) = 20

Multiply (-5 + y) * (-5 + y)
(-5(-5 + y) + y(-5 + y)) = 20
((-5 * -5 + y * -5) + y(-5 + y)) = 20
((25 + -5y) + y(-5 + y)) = 20
(25 + -5y + (-5 * y + y * y)) = 20
(25 + -5y + (-5y + y2)) = 20

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

Solving
25 + -10y + y2 = 20

Solving for variable 'y'.

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

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

Combine like terms: 20 + -20 = 0
5 + -10y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-5' to each side of the equation.
5 + -10y + -5 + y2 = 0 + -5

Reorder the terms:
5 + -5 + -10y + y2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -10y + y2 = 0 + -5
-10y + y2 = 0 + -5

Combine like terms: 0 + -5 = -5
-10y + y2 = -5

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 = -5 + 25

Reorder the terms:
25 + -10y + y2 = -5 + 25

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

Factor a perfect square on the left side:
(y + -5)(y + -5) = 20

Calculate the square root of the right side: 4.472135955

Break this problem into two subproblems by setting 
(y + -5) equal to 4.472135955 and -4.472135955.

Subproblem 1

y + -5 = 4.472135955 Simplifying y + -5 = 4.472135955 Reorder the terms: -5 + y = 4.472135955 Solving -5 + y = 4.472135955 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 = 4.472135955 + 5 Combine like terms: -5 + 5 = 0 0 + y = 4.472135955 + 5 y = 4.472135955 + 5 Combine like terms: 4.472135955 + 5 = 9.472135955 y = 9.472135955 Simplifying y = 9.472135955

Subproblem 2

y + -5 = -4.472135955 Simplifying y + -5 = -4.472135955 Reorder the terms: -5 + y = -4.472135955 Solving -5 + y = -4.472135955 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 = -4.472135955 + 5 Combine like terms: -5 + 5 = 0 0 + y = -4.472135955 + 5 y = -4.472135955 + 5 Combine like terms: -4.472135955 + 5 = 0.527864045 y = 0.527864045 Simplifying y = 0.527864045

Solution

The solution to the problem is based on the solutions from the subproblems. y = {9.472135955, 0.527864045}

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