81x^8-82x^4+1=0

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Solution for 81x^8-82x^4+1=0 equation:


Simplifying
81x8 + -82x4 + 1 = 0

Reorder the terms:
1 + -82x4 + 81x8 = 0

Solving
1 + -82x4 + 81x8 = 0

Solving for variable 'x'.

Factor a trinomial.
(1 + -81x4)(1 + -1x4) = 0

Factor a difference between two squares.
((1 + 9x2)(1 + -9x2))(1 + -1x4) = 0

Factor a difference between two squares.
((1 + 9x2)((1 + 3x)(1 + -3x)))(1 + -1x4) = 0

Factor a difference between two squares.
((1 + x2)(1 + -1x2))(1 + 9x2)(1 + 3x)(1 + -3x) = 0

Factor a difference between two squares.
((1 + x2)((1 + x)(1 + -1x)))(1 + 9x2)(1 + 3x)(1 + -3x) = 0

Subproblem 1

Set the factor '(1 + 9x2)' equal to zero and attempt to solve: Simplifying 1 + 9x2 = 0 Solving 1 + 9x2 = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 9x2 = 0 + -1 Combine like terms: 1 + -1 = 0 0 + 9x2 = 0 + -1 9x2 = 0 + -1 Combine like terms: 0 + -1 = -1 9x2 = -1 Divide each side by '9'. x2 = -0.1111111111 Simplifying x2 = -0.1111111111 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 + 3x)' equal to zero and attempt to solve: Simplifying 1 + 3x = 0 Solving 1 + 3x = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 3x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + 3x = 0 + -1 3x = 0 + -1 Combine like terms: 0 + -1 = -1 3x = -1 Divide each side by '3'. x = -0.3333333333 Simplifying x = -0.3333333333

Subproblem 3

Set the factor '(1 + -3x)' equal to zero and attempt to solve: Simplifying 1 + -3x = 0 Solving 1 + -3x = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -3x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -3x = 0 + -1 -3x = 0 + -1 Combine like terms: 0 + -1 = -1 -3x = -1 Divide each side by '-3'. x = 0.3333333333 Simplifying x = 0.3333333333

Subproblem 4

Set the factor '(1 + x2)' equal to zero and attempt to solve: Simplifying 1 + x2 = 0 Solving 1 + x2 = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x2 = 0 + -1 Combine like terms: 1 + -1 = 0 0 + x2 = 0 + -1 x2 = 0 + -1 Combine like terms: 0 + -1 = -1 x2 = -1 Simplifying x2 = -1 The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined.

Subproblem 5

Set the factor '(1 + x)' equal to zero and attempt to solve: Simplifying 1 + x = 0 Solving 1 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + x = 0 + -1 x = 0 + -1 Combine like terms: 0 + -1 = -1 x = -1 Simplifying x = -1

Subproblem 6

Set the factor '(1 + -1x)' equal to zero and attempt to solve: Simplifying 1 + -1x = 0 Solving 1 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -1x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -1x = 0 + -1 -1x = 0 + -1 Combine like terms: 0 + -1 = -1 -1x = -1 Divide each side by '-1'. x = 1 Simplifying x = 1

Solution

x = {-0.3333333333, 0.3333333333, -1, 1}

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