Is it possible to write an equation for such a
parabola in the form
f(x) = (x - a) (x - b)?
Yes
No

Yes it is possible to write an equation for such a parabola in the form

We calculate the total amount that needs to be paid by multiplying the amount per month and the total number of months.

Plan A: Total amount  = ($110.42/month)(24 months)  = $2650.08
Plan B: Total amount = ($85.47/month)(36 months) = $3076.92

Thus, Linda will pay a lesser amount for Plan A. Also, the amount that can be saved is $426.84.