A polynomial P(x) of third degree vanish when x=1\r\n&amp, x=-2\r\n. This polynomial have the v...

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A polynomial P(x) of third degree vanish when x=1\r\n&, x=-2\r\n. This polynomial have the values 4 &, 28 \r\nwhen x=-1\r\nand x=2\r\nrespectively.\r\n\r\nP(i),w h e r ei=sqrt(-1)\r\nis\r\na. purely real b.\r\nPurely imaginary \r\nc. imaginary d.\r\nNone of these
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