I have a test tomorrow on Logarithmic & Exponential Functions.

I have no clue what the hell is going on. I've studied like crazy, tried to do the problems, and everything.

I don't get it. I'm confused as all hell.

The chapter contains these sections (in this order):

Combining Functions
Inverse Functions and their Representations
Exponential Functions and Models
Logarithmic Functions and Models
Properties of Logarithms
Exponential and Logarithmic Equations
Constructing Nonlinear Models

Can anyone help me? I want to do well on the test. I want an A. But I just don't know how to do it. I asked the professor for help, but he was never able to set up a time. He never actually taught it, he just gives us group work and expects us to get it that way. I don't. I'm confused. I need help.

I don't get it, just read the examples and do some exercises. I NEVER ever ever listened to the teachers or took notes. Just f*cked around in class and studied the whole chapter a day or two before and got either a B+ or an A. Listening to teachers = overrated. Especially when you consider that the book is smarter than them.

On a sidenote, I've got a Multivariable Calculus Exam tomorrow and right now I'm hovering at an 80 average. I have to throw down an A- at least, and I've been dozing off in class. If someone can help me out with Line Integrals, Green's Theorem, Stoke's Theorem. I'll be grateful. I'll f*ckin do good for the human race.

I don't get it, just read the examples and do some exercises. I NEVER ever ever listened to the teachers or took notes. Just f*cked around in class and studied the whole chapter a day or two before and got either a B+ or an A. Listening to teachers = overrated. Especially when you consider that the book is smarter than them.

My professor wrote the book....
Which explains why reading it does not help me at all.

Exericises 13-36-Use f(x) and g(x) to find each expression symbolically. Identify its domain.
a)(f+g)(x)
b)(f-g)(x)
c)(fg)(x)
d)(f/g)(x)

13. f(x)=2x g(x)=x2

15. f(x)=x2-1 g(x)=x2+1

(The 2's after the X's are supposed to be x squared. Can't figure out how to get that in here)

??? Are you sure there's no g o f (x) or something like this ? That's what combining functions is about. When you have f (g(x)). There you just add functions.

??? Are you sure there's no g o f (x) or something like this ? That's what combining functions is about. When you have f (g(x)). There you just add functions.

(f+g) (x) = f(x) + g(x)
(f-g) (x) = f(x) - g(x)

etc ...

What I wrote is exactly what is written in the book. Like I said, my professor is a complete idiot. I believe it is supposed to be a g o f(x) or f o g(x) type of thing.

13a) 2x + x^2 Domain: All values. Range will be only positive.
13b) 2x - x^2 Domain: All values Range will be negative
13c) 2x^3 Domain: All values (can be both negative or postive)
13d) 2x/x^2 Domain: All values except for 0, Range can be any number.

15a) 2x^2 All values, range wil be positive.
15b) -2? Nothing's possible
15c) 2x^2 - 1 All values, range will be > 1
15d) x^2 - 1/x^2 + 1 All values?

I'm confused... phuck I think something's missing or I'm braindead. prob the latter.

What I wrote is exactly what is written in the book. Like I said, my professor is a complete idiot. I believe it is supposed to be a g o f(x) or f o g(x) type of thing.

well the question you asked me sounds like it came out of the first section of a chapter on combining functions, so I am guessing you are starting at the beginning with this stuff. Dont call your professor an idiot, these are legitimate basic pre-calc questions. First you need to understand basic combinations of functions (f + g) (x), after that you talk about compositions of functions (f o g)(x)

To perform basic combinations of functions, you do exactly what Mikael and J$ said.

for example (f + g) (x) would be
x^2 + 2x for #13.
2x^2 for #15

On a sidenote, I've got a Multivariable Calculus Exam tomorrow and right now I'm hovering at an 80 average. I have to throw down an A- at least, and I've been dozing off in class. If someone can help me out with Line Integrals, Green's Theorem, Stoke's Theorem. I'll be grateful. I'll f*ckin do good for the human race.

I did all this stuff last smester, but can't really remember it, I know theres a simple trick to Green's Theorem and could figure that out if you really need help

On a sidenote, I've got a Multivariable Calculus Exam tomorrow and right now I'm hovering at an 80 average. I have to throw down an A- at least, and I've been dozing off in class. If someone can help me out with Line Integrals, Green's Theorem, Stoke's Theorem. I'll be grateful. I'll f*ckin do good for the human race.

You got any friends you can talk too about the test?