x 4 − 81 = 0 x 4 = 81 x 4 = 3 4 ∨ x 4 = ( − 3 ) 4 x = 3 ∨ x = − 3
The solutions to the equation x 4 − 81 = 0 are x = 3 and x = − 3 . To find these, we took the fourth root of both sides of the equation. The fourth root of 81 is 3, leading us to these two solutions.
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