My math Teacher just throws questions at us and don't even teach us how to do them. So could anyone help explain step by step how to solve.

Quadratic equation links:

http://www.youtube.com/watch?v=ZQ-NRsWhOGI

Try watching the youtube clip above, it goes through all types of factorising for quadratic equations and it is very good.  If you can follow it then you must back it up with a lot of practice.  

2x^2 - x - 15

I was going to do this for you but you really should watch the clip.

http://web2.0calc.com/questions/grouping-method-and-factorizing-quadratic-equations

This is a very similare question that I have worked through before.

(It even has the address of the clip that I have directed you to watch on the bottom.)

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Here's another resources that are available here

 http://web2.0calc.com/questions/quadratic-formula-do-you-have-trouble-remembering-it

Thank you.

You are welcome. If you need more help post again but study what I have given you first. 

Why don't you join up.  It is very easy and we get to know you that way.