x^4+11x^2-80=0

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Solution for x^4+11x^2-80=0 equation:


Simplifying
x4 + 11x2 + -80 = 0

Reorder the terms:
-80 + 11x2 + x4 = 0

Solving
-80 + 11x2 + x4 = 0

Solving for variable 'x'.

Factor a trinomial.
(-16 + -1x2)(5 + -1x2) = 0

Subproblem 1

Set the factor '(-16 + -1x2)' equal to zero and attempt to solve: Simplifying -16 + -1x2 = 0 Solving -16 + -1x2 = 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 + -1x2 = 0 + 16 Combine like terms: -16 + 16 = 0 0 + -1x2 = 0 + 16 -1x2 = 0 + 16 Combine like terms: 0 + 16 = 16 -1x2 = 16 Divide each side by '-1'. x2 = -16 Simplifying x2 = -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 '(5 + -1x2)' equal to zero and attempt to solve: Simplifying 5 + -1x2 = 0 Solving 5 + -1x2 = 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 + -1x2 = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1x2 = 0 + -5 -1x2 = 0 + -5 Combine like terms: 0 + -5 = -5 -1x2 = -5 Divide each side by '-1'. x2 = 5 Simplifying x2 = 5 Take the square root of each side: x = {-2.236067978, 2.236067978}

Solution

x = {-2.236067978, 2.236067978}

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