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x⁴-17x²+16=0
t=x²
t²-17t+16
Δ=289-64=225
√Δ=15
t1=16
t2=1
16=x²
x=4 v x=-4
1=x²
x=1 v x=-1
x³=0
x=0
odp {-4,-1,0,1,4}