1. Originally Posted by Neil Pickup
I can confirm that Burkey is right on all counts.

Basically what it means is:
To calculate H given a set value of X, just do: (2x-3)/(x+4)

If X=-3, then H=(-9)/(1) = -9
If X=0.5, then H=(-2)/(-4.5) = -0.44 or -4/9
If X=5, then H=(7)/(9) = 0.78 or 7/9

For the next part, you need (2x-3)/(x+4) to equal three.
Multiplying both sides by (x+4) gives you (2x-3) = 3(x+4)
Expansion gives 2x-3 = 3x+12
Collecting like terms gives you x=-15

The last part is the easiest. For a fraction to be undefined, the bottom (denominator) has to be zero. So... (x+4) = 0 - and x = -4

2. Originally Posted by Neil Pickup
I can confirm that Burkey is right on all counts.
Go Burpey. You little genius

3. Originally Posted by Piper
Remember doing Number Machines in primary school?

That's all this is.

4. Substitution isn't that hard ... Year 7/8 maths basically. It felt good to do that compared to some of the stuff I have been studying for exams coming up

5. Originally Posted by Piper
my year twelve maths exams were a bit like that
the last one especially towards the four hour mark

6. Originally Posted by sledger
how long is aussie banned for ?
Did he get banned for his "gay" thread?

7. Had a maths test today. Screwed it up very badly.

Damn you, indices! [Ie; simplify

(3x)^4 y^2 a
____________

x^2 a^2 (2y)^2 ]

8. 81 x^2
---------
4a

9. What happened to the 3y^2? And where did the 4a come from?

10. Step one: Expansion
81x^4 y^2 a
____________

x^2 a^2 4y^2

Step two: Cancelling
81x^2
____________

4a

You have a y^2 in both the top and the bottom, so they cancel, leaving just a 4 on the bottom, which you may as well put in front of the a.

11. Originally Posted by Neil Pickup
Remember doing Number Machines in primary school?

That's all this is.
Ah, Primary School.

Reminds me of the time my class had a cover teacher for RE *mutters something profane about religous schools* and she did something about a Hindu monkey (not sure on the details, remember the monkey though) and we were absaloutely riotous and made paper aeroplanes and just generally talked all the way through her story about the monkey. She never came back

Ah, Year 2.

12. Originally Posted by Jamee999
Ah, Primary School.

Reminds me of the time my class had a cover teacher for RE *mutters something profane about religous schools* and she did something about a Hindu monkey (not sure on the details, remember the monkey though) and we were absaloutely riotous and made paper aeroplanes and just generally talked all the way through her story about the monkey. She never came back

Ah, Year 2.
Let me guess, that happened last week?

13. Originally Posted by shounak
Did he get banned for his "gay" thread?
Yep. He'll be back though.

14. Any math grads here ?
I am kinda struggling with topological vector spaces....

15. Originally Posted by Robertinho
Let me guess, that happened last week?
No, hence all the words sounding as if something happened ages ago.

I wasn't at school a week ago either

If it was a week ago I'd have said "Hey guys, guess what happened last week!"

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