Help me with my grade 11 maths [easy maths]

It is surely a piece of cake for you guys, but I just can't grasp how to do it. It's the first time in 11 years that I actually have to study math. Every year was easy, except this one. I'm the one to be blamed for not studying, but in 11 years, I haven't had such a bad teacher. Anyways...

I have a hard time resolving functions (I think that's what's called... "resolution des fonctions" in french.).

We did quadratic functions (ax² + 2bx + c) last year, and they're quite easy. To find the zeros of the function, all you need is the following formula ...

(-b ± √(b² - 4ac)) / 2a

What about square root functions, rational functions, absolute value functions, simple functions? What formulas do they use? If they do not use formulas, how is it done? I would really appreciate it if you guys give me an example of how it's done if you have f(x) = 0 , f(x) > 5, f(x) < 5 (inequations)

Also, another thing that has been confusing me - the teacher often mixes two functions together. How do I solve that?

For example - square root = absolute value

3√(2x + 6) + 3 = 2|4x-2| + 2

I do realize how easy it is. I can't really do anything though - the teacher isn't really helpful, and being in the academic reform, the schoolbooks aren't ready yet, so there is nowhere I can study from. I am sorry that I'm asking for so much, but it's a piece of cake math for most of you, so any help is greatly, greatly appreciated.

Thanks in advance