5x^3-24x^2-23x 90
a) Utilize location theorem to illustrate that there is at least one real zero in interval [1,3]
b) does P(x) have at least one zero in interval [1,2] or in interval [2,3]?
c) does P(x) have at least one zero between [1,1.5] or in interval [1.5,2]?