The following formula models the number of prison inmates, P, in thousands, who are in U.S. prisons 2 years after 1980. P = 2z +24z + 324 A) Find an equation in the form az+bx+c=0 that you can use to solve determine the first year in which the population of U.S. prisons was approximately 414 thousand people. Do not solve it yet. Answer: The equation is B) Now factor your equation to solve it and specifiy the first year in which the population of U.S. prisons was approximately 414 thousand people.