0=x^4+18x^2+81

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Solution for 0=x^4+18x^2+81 equation:


Simplifying
0 = x4 + 18x2 + 81

Reorder the terms:
0 = 81 + 18x2 + x4

Solving
0 = 81 + 18x2 + x4

Solving for variable 'x'.

Combine like terms: 0 + -81 = -81
-81 + -18x2 + -1x4 = 81 + 18x2 + x4 + -81 + -18x2 + -1x4

Reorder the terms:
-81 + -18x2 + -1x4 = 81 + -81 + 18x2 + -18x2 + x4 + -1x4

Combine like terms: 81 + -81 = 0
-81 + -18x2 + -1x4 = 0 + 18x2 + -18x2 + x4 + -1x4
-81 + -18x2 + -1x4 = 18x2 + -18x2 + x4 + -1x4

Combine like terms: 18x2 + -18x2 = 0
-81 + -18x2 + -1x4 = 0 + x4 + -1x4
-81 + -18x2 + -1x4 = x4 + -1x4

Combine like terms: x4 + -1x4 = 0
-81 + -18x2 + -1x4 = 0

Factor out the Greatest Common Factor (GCF), '-1'.
-1(81 + 18x2 + x4) = 0

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

Ignore the factor -1.

Subproblem 1

Set the factor '(9 + x2)' equal to zero and attempt to solve: Simplifying 9 + x2 = 0 Solving 9 + x2 = 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 + x2 = 0 + -9 Combine like terms: 9 + -9 = 0 0 + x2 = 0 + -9 x2 = 0 + -9 Combine like terms: 0 + -9 = -9 x2 = -9 Simplifying x2 = -9 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 '(9 + x2)' equal to zero and attempt to solve: Simplifying 9 + x2 = 0 Solving 9 + x2 = 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 + x2 = 0 + -9 Combine like terms: 9 + -9 = 0 0 + x2 = 0 + -9 x2 = 0 + -9 Combine like terms: 0 + -9 = -9 x2 = -9 Simplifying x2 = -9 The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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