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Let P(x)=x^2+b x+cw h e r eba n dc are ...

Let `P(x)=x^2+b x+cw h e r eba n dc` are integer. If `P(x)` is a factor of both `x^4+6x^2+25a n d3x^4+4x^2+28 x+5,t h e n` a.`P(x)=0` has imaginary roots b.`P(x)=0` has roots of opposite c.`P(1)=4` d .`P(1)=6`

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