Question

True or false: the value of -1 is a lower bound for the zeros of the function shown below
F(x)=x^4+x^3-11x^2-9x+18

Answer 1

use synthetic division to divide -1 into the polynomial and check for alternating signs on the bottom row

http://www.wtamu.edu/academic/anns/mps/math/mathlab/col_algebra/col_alg_tut39_zero2.htm