¿Cómo se relaciona la dependencia funcional entre una variable y una incógnita? ¿Cuándo y por qué son diferentes?

Omar is going on a road trip! the car rental company offers him two types of cars. each car has a fixed price, but he also needs to consider the cost of fuel. the first car costs $90 to rent, and because of its fuel consumption rate, there's an additional cost of s0.50 per kilometer driven.

What is the result of the following division?

How do you do the foil method with polynomials?