What is the range of the function?

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?

Write as a product: ac^2–ad+c^3–cd–bc^2+bd

Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect