3
1
2
4
a)
w(x)=x4+2x3−8x−16=x4−8x+2x3−16=x(x3−8)+2(x3−8)=
=(x3−8)(x+2)=(x−2)(x2+2x+4)Δ=4−4⋅4<0(x+2)
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