3
the possible values of k?
NGiven f(x) = 2x + ax? - 7a²x - 6 a?, determine whether or not x - a and x + a are
factors of f(x). Hence find, in terms of a, the roots of f(x) = 0.

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.