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A polynomial P(x) of third degree vanish...

A polynomial P(x) of third degree vanish when `x=1` & `x=-2` . This polynomial have the values 4 & 28 when `x=-1` and `x=2` respectively. One of the factor of `P(x)` is
a.`x+1` b. `x-2` c. `3x+1` d. None of these

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