Posted by Zac on Saturday, May 5, 2012 at 8:53pm.
second:
x^2(2x+1)+4(2x+1)
(2x+1)(x^2+4)
(2x+1)(x+j)(x-j)
so if the expression were equal zero, then
zeroes are -1/2, -j,+j where j= sqrt(-1)
so the only rational root is -1/2
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