oh and 2^-1/2^3 = 2^4???
As you can see, the sign of the base number and the sign of the power do different things. Please review the laws of exponents!
Note I do not know the law of exponents. I am self studying and self teaching myself for an exam. I do not know where to find resources so I just do questions.
By self teaching myself for an exam I mean that I have been given no basic background at all. No teachers or school or anything :/
If you are self studying, what are you studying from? Any math book that deals with this topic will have the rules in it. As an alternative, it is pretty easy to type "laws of exponents" into google or any search engine of your choice.
I have a workbook but I have not used it yet. I am using past papers and any problems I come across I post on this forum. Since the past papers are relatively generic, they tend to have the same questions. I'm hoping the exam follows this. It seems to get easier by the year anyway. In the 2003 paper I was dealing with frustums which have incredibly annoying formulas while in 2008 it was only rectangles with cuboids in 2009.
Personally, I found past papers very effective but only where there was a mark scheme nearby detailing the answers. It just goes to show that maths is about trying everything and seeing what works for you
i never said don't use past papers. in fact, i recommend using past papers. i used them when i was doing O and A-levels, and i use them when i was in college. what this user is doing is not what you or i did.