2x^8-4x^4=16

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Solution for 2x^8-4x^4=16 equation:


Simplifying
2x8 + -4x4 = 16

Reorder the terms:
-4x4 + 2x8 = 16

Solving
-4x4 + 2x8 = 16

Solving for variable 'x'.

Reorder the terms:
-16 + -4x4 + 2x8 = 16 + -16

Combine like terms: 16 + -16 = 0
-16 + -4x4 + 2x8 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-8 + -2x4 + x8) = 0

Factor a trinomial.
2((-2 + -1x4)(4 + -1x4)) = 0

Factor a difference between two squares.
2((-2 + -1x4)((2 + x2)(2 + -1x2))) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(-2 + -1x4)' equal to zero and attempt to solve: Simplifying -2 + -1x4 = 0 Solving -2 + -1x4 = 0 Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -1x4 = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -1x4 = 0 + 2 -1x4 = 0 + 2 Combine like terms: 0 + 2 = 2 -1x4 = 2 Divide each side by '-1'. x4 = -2 Simplifying x4 = -2 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 '(2 + x2)' equal to zero and attempt to solve: Simplifying 2 + x2 = 0 Solving 2 + x2 = 0 Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x2 = 0 + -2 Combine like terms: 2 + -2 = 0 0 + x2 = 0 + -2 x2 = 0 + -2 Combine like terms: 0 + -2 = -2 x2 = -2 Simplifying x2 = -2 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 '(2 + -1x2)' equal to zero and attempt to solve: Simplifying 2 + -1x2 = 0 Solving 2 + -1x2 = 0 Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -1x2 = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1x2 = 0 + -2 -1x2 = 0 + -2 Combine like terms: 0 + -2 = -2 -1x2 = -2 Divide each side by '-1'. x2 = 2 Simplifying x2 = 2 Take the square root of each side: x = {-1.414213562, 1.414213562}

Solution

x = {-1.414213562, 1.414213562}

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