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∛x = t
t²+2t-3=0
t²-t+3t-3=0
t(t-1)+3(t-1)=0
(t-1)(t+3)=0
t=1 v t=-3
∛x=1 v ∛x=-3
x=1 v x=-27
c)
⁴√x=p
p²-4p+4=0
(p-2)²=0
p=2
⁴√x=2
x=2⁴=16