Please help me with number 8 please!!

(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.

In which form is the following function written? y = - 2(x – 3)(x + 5)

Aprobability experiment is conducted in which the sample space of the experiment is s={7,8,9,10,11,12,13,14,15,16,17,18 }, event f={7,8,9,10,11,12}, and event g={11,12,13,14}. assume that each outcome is equally likely. list the outcomes in f or g. find p(f or g) by counting the number of outcomes in f or g. determine p(f or g) using the general addition rule.