Question

Select one of the factors of x3 + 3x2 + 7x + 21

Answer 1

which one?

Answer 2

form the number on the end

your possible roots will be +- 1, 3, 7, 21

Answer 3

since there are no sign changes in teh equation, there are no positive roots

which leaves us with:

-(1,3,7,21)

but then again, if there are option to select from, the roots need not be rational at all