Someone give me a reminder on converting factored form into standard form, per say (x - 9)(x + 3)

An easy way to do it is just to multiply the equations together. You can use a box to make this easier. This is how to do it.

In all honesty, there really is no “work” per say to show. mainly it’s just using the process of elimination. the question is asking which domain(s) would be the most appropriate for the function c(n). n is the number of observed vehicles so right away, 1, 2, and 3 can be eliminated.why? 1, 2 start in the negatives and therefore it is impossible to observe negative cars. so, #4 would be the best answer to the given problem.