36x4 - 81 is a difference of 2 squares and so can be factorised as follows:
(6x2 + 9)*(6x2 - 9)
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± 3 to the fourth power equals 81.
x4 - 81 = 0x4 = 81x = 3
34 = 81 , no, that would be three to the third, three to the fourth would be 81 X 3 = 243
81 minus 86 = -5
0.3333