2x^4-20x^2=-18

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Solution for 2x^4-20x^2=-18 equation:


Simplifying
2x4 + -20x2 = -18

Reorder the terms:
-20x2 + 2x4 = -18

Solving
-20x2 + 2x4 = -18

Solving for variable 'x'.

Reorder the terms:
18 + -20x2 + 2x4 = -18 + 18

Combine like terms: -18 + 18 = 0
18 + -20x2 + 2x4 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(9 + -10x2 + x4) = 0

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

Factor a difference between two squares.
2(((1 + x)(1 + -1x))(9 + -1x2)) = 0

Factor a difference between two squares.
2(((3 + x)(3 + -1x))(1 + x)(1 + -1x)) = 0

Ignore the factor 2.

Subproblem 1

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 2

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

Subproblem 3

Set the factor '(3 + x)' equal to zero and attempt to solve: Simplifying 3 + x = 0 Solving 3 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + x = 0 + -3 x = 0 + -3 Combine like terms: 0 + -3 = -3 x = -3 Simplifying x = -3

Subproblem 4

Set the factor '(3 + -1x)' equal to zero and attempt to solve: Simplifying 3 + -1x = 0 Solving 3 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1x = 0 + -3 -1x = 0 + -3 Combine like terms: 0 + -3 = -3 -1x = -3 Divide each side by '-1'. x = 3 Simplifying x = 3

Solution

x = {-1, 1, -3, 3}

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