a: P(x)=2x^3-2x^3+x^2+3x^2-4x^2-3x+5+1=-3x+6
b: P(0)=-3*0+6=6
P(-1)=3+6=9
P(1/3)=-1+6=5
c: P(x)=0
=>-3x+6=0
=>x=2
P(x)=1
=>-3x+6=1
=>x=5/3
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