1. the total number of seats in an auditorium is modeled by f(x) = 2x2 – 6x, where x represents the number of rows. how many rows are there in the auditorium if it has a total of 416 seats? jose knows to plug in the total seats for f(x): 416 = 2x2 – 6x
jose needs to solve for x to determine the number of rows. he decides to use his calculator. under y =, he types in 2x2 – 6x. he checks the table for when y = 0.
he gets the two solutions:
x = 0, x= 3
jose determines the auditorium has 3 rows.

error:

correct solution: