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2x⁴-x³-3x² = 0
x²(2x²-x-3)=0
x²(2x²+2x-3x-3)=0
x²*[ 2x(x+1)-3(x+1)]=0
x² (x+1)(2x-3)=0
x=0 v x+1=0 v 2x-3=0
Odp. x∈ {-1, 0, 3/2}
Δ= 1+24=25 , √Δ=5
x=
x=
Df= R/ {, -1, 0, 1,5}