(x^4-16)(x^4-18x^2+81)=0

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Solution for (x^4-16)(x^4-18x^2+81)=0 equation: 


Simplifying
(x4 + -16)(x4 + -18x2 + 81) = 0

Reorder the terms:
(-16 + x4)(x4 + -18x2 + 81) = 0

Reorder the terms:
(-16 + x4)(81 + -18x2 + x4) = 0

Multiply (-16 + x4) * (81 + -18x2 + x4)
(-16(81 + -18x2 + x4) + x4(81 + -18x2 + x4)) = 0
((81 * -16 + -18x2 * -16 + x4 * -16) + x4(81 + -18x2 + x4)) = 0
((-1296 + 288x2 + -16x4) + x4(81 + -18x2 + x4)) = 0
(-1296 + 288x2 + -16x4 + (81 * x4 + -18x2 * x4 + x4 * x4)) = 0
(-1296 + 288x2 + -16x4 + (81x4 + -18x6 + x8)) = 0

Combine like terms: -16x4 + 81x4 = 65x4
(-1296 + 288x2 + 65x4 + -18x6 + x8) = 0

Solving
-1296 + 288x2 + 65x4 + -18x6 + x8 = 0

Solving for variable 'x'.

The solution to this equation could not be determined.

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