Here’s the Powerpoint from today’s lesson. Talia – it would be fantastic (as you say!) if you could download this and look over it carefully, and then get on with Ex 4F – 4H.
You’re going to be given some exam questions to do over half term, so make sure you have those too.
ok…i get the powerpoint, but i dnt have my txt book or exersise book so i cnt do the class work or the homework. but i’ll come c u after grade card reading 2 get the work.
D’oh! Simple… Ex 4F to 4H. As much practice as possible!
hello..im a bit stuck on the end of chapter 4 (excersise 4G question 2) so i’ll come 2 u in school for help and i’ll do all the other excersises again from the book. is that alright?
Sorry – not got a C1 here at home. If you outline it here though I can help… or if you’re really stuck just move on. I’ll ask Tibble if she’s got one…
Hi Talia. That man is soooooooo rude!!
The graph you are given is y = f(x)
It doesn’t matter what the function actually is, just that it gives you that graph.
You then have to work out what the other graphs look like, using that one as your reference each time.
Example:
(a) f(x) + 2 When you see “f(x)” you can read it as “the original y value” ie from your reference graph, so this one means “the new y values are the old y values + 2″
These are similar:
(d) f(x) – 2
(g)0.5 f(x)
(c) 2 f(x)
(h) -f(x)
[sorry, got the order all mixed up - have adjusted the letters now]
Those are all the ones which are straightforward
OK now for the hard bit!
When what is in the bracket changes,
eg (e) f(2x)
you choose an x value on your new graph and plot what was at 2x on the reference graph. This will have the effect of squashing everything up (sideways) compared with the original graph
(b) f(x – 1)
(f) f(0.5x)
If that’s as clear as mud, shout for help again!
Mrs T.