z^4+2z^2-8=0

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Solution for z^4+2z^2-8=0 equation:


Simplifying
z4 + 2z2 + -8 = 0

Reorder the terms:
-8 + 2z2 + z4 = 0

Solving
-8 + 2z2 + z4 = 0

Solving for variable 'z'.

Factor a trinomial.
(-4 + -1z2)(2 + -1z2) = 0

Subproblem 1

Set the factor '(-4 + -1z2)' equal to zero and attempt to solve: Simplifying -4 + -1z2 = 0 Solving -4 + -1z2 = 0 Move all terms containing z to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -1z2 = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -1z2 = 0 + 4 -1z2 = 0 + 4 Combine like terms: 0 + 4 = 4 -1z2 = 4 Divide each side by '-1'. z2 = -4 Simplifying z2 = -4 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 + -1z2)' equal to zero and attempt to solve: Simplifying 2 + -1z2 = 0 Solving 2 + -1z2 = 0 Move all terms containing z to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -1z2 = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1z2 = 0 + -2 -1z2 = 0 + -2 Combine like terms: 0 + -2 = -2 -1z2 = -2 Divide each side by '-1'. z2 = 2 Simplifying z2 = 2 Take the square root of each side: z = {-1.414213562, 1.414213562}

Solution

z = {-1.414213562, 1.414213562}

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