0=5x^4-36x^2-81

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Solution for 0=5x^4-36x^2-81 equation:


Simplifying
0 = 5x4 + -36x2 + -81

Reorder the terms:
0 = -81 + -36x2 + 5x4

Solving
0 = -81 + -36x2 + 5x4

Solving for variable 'x'.

Combine like terms: 0 + 81 = 81
81 + 36x2 + -5x4 = -81 + -36x2 + 5x4 + 81 + 36x2 + -5x4

Reorder the terms:
81 + 36x2 + -5x4 = -81 + 81 + -36x2 + 36x2 + 5x4 + -5x4

Combine like terms: -81 + 81 = 0
81 + 36x2 + -5x4 = 0 + -36x2 + 36x2 + 5x4 + -5x4
81 + 36x2 + -5x4 = -36x2 + 36x2 + 5x4 + -5x4

Combine like terms: -36x2 + 36x2 = 0
81 + 36x2 + -5x4 = 0 + 5x4 + -5x4
81 + 36x2 + -5x4 = 5x4 + -5x4

Combine like terms: 5x4 + -5x4 = 0
81 + 36x2 + -5x4 = 0

Factor a trinomial.
(9 + -1x2)(9 + 5x2) = 0

Factor a difference between two squares.
((3 + x)(3 + -1x))(9 + 5x2) = 0

Subproblem 1

Set the factor '(9 + 5x2)' equal to zero and attempt to solve: Simplifying 9 + 5x2 = 0 Solving 9 + 5x2 = 0 Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 5x2 = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 5x2 = 0 + -9 5x2 = 0 + -9 Combine like terms: 0 + -9 = -9 5x2 = -9 Divide each side by '5'. x2 = -1.8 Simplifying x2 = -1.8 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 '(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 3

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 = {-3, 3}

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