(y-1)(y-1)-20=0

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Solution for (y-1)(y-1)-20=0 equation:


Simplifying
(y + -1)(y + -1) + -20 = 0

Reorder the terms:
(-1 + y)(y + -1) + -20 = 0

Reorder the terms:
(-1 + y)(-1 + y) + -20 = 0

Multiply (-1 + y) * (-1 + y)
(-1(-1 + y) + y(-1 + y)) + -20 = 0
((-1 * -1 + y * -1) + y(-1 + y)) + -20 = 0
((1 + -1y) + y(-1 + y)) + -20 = 0
(1 + -1y + (-1 * y + y * y)) + -20 = 0
(1 + -1y + (-1y + y2)) + -20 = 0

Combine like terms: -1y + -1y = -2y
(1 + -2y + y2) + -20 = 0

Reorder the terms:
1 + -20 + -2y + y2 = 0

Combine like terms: 1 + -20 = -19
-19 + -2y + y2 = 0

Solving
-19 + -2y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '19' to each side of the equation.
-19 + -2y + 19 + y2 = 0 + 19

Reorder the terms:
-19 + 19 + -2y + y2 = 0 + 19

Combine like terms: -19 + 19 = 0
0 + -2y + y2 = 0 + 19
-2y + y2 = 0 + 19

Combine like terms: 0 + 19 = 19
-2y + y2 = 19

The y term is -2y.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2y + 1 + y2 = 19 + 1

Reorder the terms:
1 + -2y + y2 = 19 + 1

Combine like terms: 19 + 1 = 20
1 + -2y + y2 = 20

Factor a perfect square on the left side:
(y + -1)(y + -1) = 20

Calculate the square root of the right side: 4.472135955

Break this problem into two subproblems by setting 
(y + -1) equal to 4.472135955 and -4.472135955.

Subproblem 1

y + -1 = 4.472135955 Simplifying y + -1 = 4.472135955 Reorder the terms: -1 + y = 4.472135955 Solving -1 + y = 4.472135955 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + y = 4.472135955 + 1 Combine like terms: -1 + 1 = 0 0 + y = 4.472135955 + 1 y = 4.472135955 + 1 Combine like terms: 4.472135955 + 1 = 5.472135955 y = 5.472135955 Simplifying y = 5.472135955

Subproblem 2

y + -1 = -4.472135955 Simplifying y + -1 = -4.472135955 Reorder the terms: -1 + y = -4.472135955 Solving -1 + y = -4.472135955 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + y = -4.472135955 + 1 Combine like terms: -1 + 1 = 0 0 + y = -4.472135955 + 1 y = -4.472135955 + 1 Combine like terms: -4.472135955 + 1 = -3.472135955 y = -3.472135955 Simplifying y = -3.472135955

Solution

The solution to the problem is based on the solutions from the subproblems. y = {5.472135955, -3.472135955}

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