(x^8)+(15x^4)-16=0

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Solution for (x^8)+(15x^4)-16=0 equation:


Simplifying
(x8) + (15x4) + -16 = 0
x8 + (15x4) + -16 = 0

Reorder the terms:
-16 + (15x4) + x8 = 0

Solving
-16 + (15x4) + x8 = 0

Solving for variable 'x'.

Factor a trinomial.
(-16 + -1x4)(1 + -1x4) = 0

Factor a difference between two squares.
(-16 + -1x4)((1 + x2)(1 + -1x2)) = 0

Factor a difference between two squares.
(-16 + -1x4)((1 + x2)((1 + x)(1 + -1x))) = 0

Subproblem 1

Set the factor '(-16 + -1x4)' equal to zero and attempt to solve: Simplifying -16 + -1x4 = 0 Solving -16 + -1x4 = 0 Move all terms containing x to the left, all other terms to the right. Add '16' to each side of the equation. -16 + 16 + -1x4 = 0 + 16 Combine like terms: -16 + 16 = 0 0 + -1x4 = 0 + 16 -1x4 = 0 + 16 Combine like terms: 0 + 16 = 16 -1x4 = 16 Divide each side by '-1'. x4 = -16 Simplifying x4 = -16 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 + 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 3

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 4

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 = {-1, 1}

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