I got yes, is that correct?
That is a different question.
Do you have any idea if my answer is correct?
what does it mean to be an lower bound?
Alternation between non negative and non positive in signs, post division.
hmm, there is a thrm about it, can you post your materials thrm for it?
http://www.wtamu.edu/academic/anns/mps/math/mathlab/col_algebra/col_alg_tut39_zero2.htm this seems to be what you are learning about
2x3 + 3x2 - 4x + 4 0 4 14 20 k=2| 2 7 10 24 since all the results are the same sign ... k=2 seems to be what type of bound?
2x3 + 3x2 - 4x + 4 0 -4 2 4 k=-2| 2 -1 -2 8 when we let k=-2, the signs are not alternating are they ...
http://www.wolframalpha.com/input/?i=y%3D2x%5E3+%2B+3x%5E2+-+4x+%2B+4 notice that it only has one real root, and it is less than 2 ... it is even less then -2 if tha tmatters
Okay, so it is not lower bound.