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x²-1=(x+1)(x-1)
W(-1)=-1-a+b=0
W(1)=1+a+b=0
-a+b=1
a+b=-1
----------- +
2b=0
b=0
a=-1
2.
W(-1)=-|p|+1-|p-1|+3=1
|p|+|p-1|=3
Dla p<0
-p-(p-1)=3
-p-p+1=3
-2p=2
p=-1
Dla 0≤p<1
p-p+1=3
1=3 sprzecznosc
Dka p≥1
p+p-1=3
2p=4
p=2
Odp. p=-1 lub p=2