-4=x^4-5x^2

Solution for -4=x^4-5x^2 equation:

Simplifying
-4 = x4 + -5x2

Reorder the terms:
-4 = -5x2 + x4

Solving
-4 = -5x2 + x4

Solving for variable 'x'.

Reorder the terms:
-4 + 5x2 + -1x4 = -5x2 + 5x2 + x4 + -1x4

Combine like terms: -5x2 + 5x2 = 0
-4 + 5x2 + -1x4 = 0 + x4 + -1x4
-4 + 5x2 + -1x4 = x4 + -1x4

Combine like terms: x4 + -1x4 = 0
-4 + 5x2 + -1x4 = 0

Factor a trinomial.
(-4 + x2)(1 + -1x2) = 0

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

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

Subproblem 1
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 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 '(1 + x)' equal to zero and attempt to solve:

Simplifying
1 + x = 0

Solving
1 + x = 0

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

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

Combine like terms: 1 + -1 = 0
0 + x = 0 + -1
x = 0 + -1

Combine like terms: 0 + -1 = -1
x = -1

Simplifying
x = -1
Subproblem 4
Set the factor '(1 + -1x)' equal to zero and attempt to solve:

Simplifying
1 + -1x = 0

Solving
1 + -1x = 0

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

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

Combine like terms: 1 + -1 = 0
0 + -1x = 0 + -1
-1x = 0 + -1

Combine like terms: 0 + -1 = -1
-1x = -1

Divide each side by '-1'.
x = 1

Simplifying
x = 1
Solution
x = {-2, 2, -1, 1}