X^4+16X^2-80=0

Solution for X^4+16X^2-80=0 equation:

Simplifying
X4 + 16X2 + -80 = 0

Reorder the terms:
-80 + 16X2 + X4 = 0

Solving
-80 + 16X2 + X4 = 0

Solving for variable 'X'.

Factor a trinomial.
(-20 + -1X2)(4 + -1X2) = 0

Factor a difference between two squares.
(-20 + -1X2)((2 + X)(2 + -1X)) = 0

Subproblem 1
Set the factor '(-20 + -1X2)' equal to zero and attempt to solve:

Simplifying
-20 + -1X2 = 0

Solving
-20 + -1X2 = 0

Move all terms containing X to the left, all other terms to the right.

Add '20' to each side of the equation.
-20 + 20 + -1X2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -1X2 = 0 + 20
-1X2 = 0 + 20

Combine like terms: 0 + 20 = 20
-1X2 = 20

Divide each side by '-1'.
X2 = -20

Simplifying
X2 = -20

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 + X)' equal to zero and attempt to solve:

Simplifying
2 + X = 0

Solving
2 + X = 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 + X = 0 + -2

Combine like terms: 2 + -2 = 0
0 + X = 0 + -2
X = 0 + -2

Combine like terms: 0 + -2 = -2
X = -2

Simplifying
X = -2
Subproblem 3
Set the factor '(2 + -1X)' equal to zero and attempt to solve:

Simplifying
2 + -1X = 0

Solving
2 + -1X = 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 + -1X = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -1X = 0 + -2
-1X = 0 + -2

Combine like terms: 0 + -2 = -2
-1X = -2

Divide each side by '-1'.
X = 2

Simplifying
X = 2
Solution
X = {-2, 2}