9x^4-9x^2+2=20

Solution for 9x^4-9x^2+2=20 equation:

Simplifying
9x4 + -9x2 + 2 = 20

Reorder the terms:
2 + -9x2 + 9x4 = 20

Solving
2 + -9x2 + 9x4 = 20

Solving for variable 'x'.

Reorder the terms:
2 + -20 + -9x2 + 9x4 = 20 + -20

Combine like terms: 2 + -20 = -18
-18 + -9x2 + 9x4 = 20 + -20

Combine like terms: 20 + -20 = 0
-18 + -9x2 + 9x4 = 0

Factor out the Greatest Common Factor (GCF), '9'.
9(-2 + -1x2 + x4) = 0

Factor a trinomial.
9((-1 + -1x2)(2 + -1x2)) = 0

Ignore the factor 9.
Subproblem 1
Set the factor '(-1 + -1x2)' equal to zero and attempt to solve:

Simplifying
-1 + -1x2 = 0

Solving
-1 + -1x2 = 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 + -1x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -1x2 = 0 + 1
-1x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-1x2 = 1

Divide each side by '-1'.
x2 = -1

Simplifying
x2 = -1

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 + -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}