1. So if we can't write in calculator notation, how do we show normCdf, normPdf, invNorm etc..? because they don't really have 'formulas' as we just type them into our calculator
2. If we have to sketch graphs like y=e^x+(-e)^-x or something (in Exam 1), how would we know what to do?
1. Believe it or not, they do have formula.
However, I cannot articulate in any way better than Stonecold has in
this thread. I suggest giving it a read, and if you're still unsure, say what you're specifically unsure about and I can offer some more help.
2. VCAA should not expect you to sketch something so tricky on exam 1 - if you do get it, I'd sketch the graph by addition of ordinates. You can find a video on how to do addition of ordinates
here, if you're still unsure after watching it, give us a shout.
Is it better to do multiple choice or extended response first for Exam 2?
If you look through the first few questions, you can see an answer I've supplied for this.
alright this is probably a 'stupid' q so I am glad that there is a thread loool
when finding the derivative of something, is this the correct mathematical notation
y = x2
(x2)
=2x
also, say if I wanted to sub in 3 into that derivative, how would I signify it? ATM I just write 'sub in x=3' on the side. Do we need to signify it or can we just write
= 6
?
sorry if that didn't make sense lol
Okay, notation questions like this are very common. Writing
is so common, you often forget what you're doing/actually saying. You see,
is an operator. When this operator is applied to a function (in this case, y), we know that we want to differentiate this function.
With this in mind, this means that when we write
, this is just a neater way of writing
. From this, if you write
, since
, this is just like writing
or
- which you know is not what we want to find.
You have two different options you can use - you wrote one,
, or you can write
.
Subbing in is fine the way you've done it, abeybaby's method is how I used to do it in methods.