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If 2(1/3)³+3(1/3)²-6(1/3)+7 = 0 then 1/3 is zero of the polynomial

but it is not equal to 0

therefore 1/3 is not a zero of p(x)

0 then 1/3 is zero of the polynomial

but it is not equal to 0

therefore 1/3 is not a zero of p(x)

but it is not equal to 0

therefore 1/3 is not a zero of p(x)