x^8+x^4-20=

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Solution for x^8+x^4-20= equation:


Simplifying
x8 + x4 + -20 = 0

Reorder the terms:
-20 + x4 + x8 = 0

Solving
-20 + x4 + x8 = 0

Solving for variable 'x'.

Factor a trinomial.
(-5 + -1x4)(4 + -1x4) = 0

Factor a difference between two squares.
(-5 + -1x4)((2 + x2)(2 + -1x2)) = 0

Subproblem 1

Set the factor '(-5 + -1x4)' equal to zero and attempt to solve: Simplifying -5 + -1x4 = 0 Solving -5 + -1x4 = 0 Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -1x4 = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -1x4 = 0 + 5 -1x4 = 0 + 5 Combine like terms: 0 + 5 = 5 -1x4 = 5 Divide each side by '-1'. x4 = -5 Simplifying x4 = -5 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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