Use this formula to find all the solutions of the equation. (round terms to four decimal places)
x^5+243=0

k=0:
k=1:
k=2:
k=3:
k=4:

I might be misreading something here but if:

x^5+243=0  subtract 243 from both sides

x^5=-243  raise both sides to the 1/5 power  (or take the fifth root of both sides)

x=-3

So there is only one solution, x=-3

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