(y^4-1)=0

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Solution for (y^4-1)=0 equation:


Simplifying
(y4 + -1) = 0

Reorder the terms:
(-1 + y4) = 0

Remove parenthesis around (-1 + y4)
-1 + y4 = 0

Solving
-1 + y4 = 0

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 + y4 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + y4 = 0 + 1
y4 = 0 + 1

Combine like terms: 0 + 1 = 1
y4 = 1

Simplifying
y4 = 1

Reorder the terms:
-1 + y4 = 1 + -1

Combine like terms: 1 + -1 = 0
-1 + y4 = 0

Factor a difference between two squares.
(1 + y2)(-1 + y2) = 0

Factor a difference between two squares.
(1 + y2)((1 + y)(-1 + y)) = 0

Subproblem 1

Set the factor '(1 + y2)' equal to zero and attempt to solve: Simplifying 1 + y2 = 0 Solving 1 + y2 = 0 Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y2 = 0 + -1 Combine like terms: 1 + -1 = 0 0 + y2 = 0 + -1 y2 = 0 + -1 Combine like terms: 0 + -1 = -1 y2 = -1 Simplifying y2 = -1 The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined.

Subproblem 2

Set the factor '(1 + y)' equal to zero and attempt to solve: Simplifying 1 + y = 0 Solving 1 + y = 0 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 = 0 + -1 Combine like terms: 1 + -1 = 0 0 + y = 0 + -1 y = 0 + -1 Combine like terms: 0 + -1 = -1 y = -1 Simplifying y = -1

Subproblem 3

Set the factor '(-1 + y)' equal to zero and attempt to solve: Simplifying -1 + y = 0 Solving -1 + y = 0 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 = 0 + 1 Combine like terms: -1 + 1 = 0 0 + y = 0 + 1 y = 0 + 1 Combine like terms: 0 + 1 = 1 y = 1 Simplifying y = 1

Solution

y = {-1, 1}

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