Hello,

I've been out of school for several years and now back in school

as I'm changing career fields.

I've signed up to seek help with some of my Pre-Cal math as I've

been struggling with ADHD. I'm properly medicated, but do require

step by step in order for math success.

I have an upcoming test this week and need to get a good grade.

One section I'm having some problems in relations to

is the Difference quotient.

It's the typical: f(x + h) - f(x)/h

This I am okay with, however it is examples such as these

that my book from Dawson College is useless. Our class average

is 41% and I received a 56% on the last test.

f(x) = X squared + x

Find:

a) f(2 + h) - f(2)/h

b) f(x) - f(2)/x-2

c) f(2+h) - f(2 -h)/2h

Do I subsitute only the f with xSquared + x???

Would example b) read: xSquared + x - 2/x-2

I also have no idea what to subsitute with example C)

I did what I thought was right and turns out to be incorrect

in our answer section.

One thing that doesn't help us is the fact that the faculty has

advised us of incorrect answers in our book (hand written I

might add). They unfortunately have no idea which answers

are wrong so this makes it even more confusing.

If someone can help, that would be greatly appreciated.

Thank you