81-u^4=0

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Solution for 81-u^4=0 equation:


Simplifying
81 + -1u4 = 0

Solving
81 + -1u4 = 0

Solving for variable 'u'.

Move all terms containing u to the left, all other terms to the right.

Add '-81' to each side of the equation.
81 + -81 + -1u4 = 0 + -81

Combine like terms: 81 + -81 = 0
0 + -1u4 = 0 + -81
-1u4 = 0 + -81

Combine like terms: 0 + -81 = -81
-1u4 = -81

Divide each side by '-1'.
u4 = 81

Simplifying
u4 = 81

Reorder the terms:
-81 + u4 = 81 + -81

Combine like terms: 81 + -81 = 0
-81 + u4 = 0

Factor a difference between two squares.
(9 + u2)(-9 + u2) = 0

Factor a difference between two squares.
(9 + u2)((3 + u)(-3 + u)) = 0

Subproblem 1

Set the factor '(9 + u2)' equal to zero and attempt to solve: Simplifying 9 + u2 = 0 Solving 9 + u2 = 0 Move all terms containing u to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + u2 = 0 + -9 Combine like terms: 9 + -9 = 0 0 + u2 = 0 + -9 u2 = 0 + -9 Combine like terms: 0 + -9 = -9 u2 = -9 Simplifying u2 = -9 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 '(3 + u)' equal to zero and attempt to solve: Simplifying 3 + u = 0 Solving 3 + u = 0 Move all terms containing u to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + u = 0 + -3 Combine like terms: 3 + -3 = 0 0 + u = 0 + -3 u = 0 + -3 Combine like terms: 0 + -3 = -3 u = -3 Simplifying u = -3

Subproblem 3

Set the factor '(-3 + u)' equal to zero and attempt to solve: Simplifying -3 + u = 0 Solving -3 + u = 0 Move all terms containing u to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + u = 0 + 3 Combine like terms: -3 + 3 = 0 0 + u = 0 + 3 u = 0 + 3 Combine like terms: 0 + 3 = 3 u = 3 Simplifying u = 3

Solution

u = {-3, 3}

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