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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. `P(i),w h e r ei=sqrt(-1)` is a. purely real b. Purely imaginary c. imaginary d. None of these

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RESONANCE DPP-RELATIONS AND FUNCTIONS XII-All Questions
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