Is it wrong that I'm considering applying for medicine, a subject which I have have never had any interest in before, purely because I want to be like House?

Whats the answer to this: A line of equation y=2x is tangent to a circle with centre (t,0) and radius 2 units. Find the value of t.

I imagine you need to sub the equation of the line into the equation of the circle, then use the discriminant(b^2-4ac=0) to work out "t", but all these letters are confusing me.

No. It seems fairly obvious to me that there are at least two solutions, although the second one is not necessarily negative.

Frankly, the setup just seems to be a fancy way of saying "solve these simultaneous equations" - just remember that it's maths, not physics, so there are no unphysical solutions, and not giving one of them is a good way to drop an easy point.

## you'll do fine!

in fact im sure you will do more than fine. you always do well : )

good luck! x x x

## gooooood luck!

## Thank ye both.

Luckily it's Sociology. And the easiest module of the 3.

Still:

:(

## Get off the internet and do some work.

:)

## I'll have you know

I am on a Sociology website!

## Ok

well good luck then.

## I've got maths higher tomorrow

Did a past paper and got 43/50

</smug>

## Nerd ^

## Smug nerd*

Is it wrong that I'm considering applying for medicine, a subject which I have have never had any interest in before, purely because I want to be like House?

## Absolutely not.

That's the best reason to do it ever!

## Pffschtzh

I got 100% in every single pure module at a-level first time.

## Good for you.

Cookie?

## How advanced is higher maths?

## dunno

differentiation, integration, logarithms, wave function, "further trig", vectors and all that jazz

## Also:

Whats the answer to this: A line of equation y=2x is tangent to a circle with centre (t,0) and radius 2 units. Find the value of t.

I imagine you need to sub the equation of the line into the equation of the circle, then use the discriminant(b^2-4ac=0) to work out "t", but all these letters are confusing me.

## ..

That's right, if you sub the line equation into the circle equation, you get a quadratic equation for t. You just need to use b=2t, a=5, c=t^2-4.

## but what happens to the Xs?

Isnt the equation after subbing in the line

(X-t)^2+Y^2=4

which gives

5X^2+t^2-2tx-4=0

where from there?

## ..

Compare it with ax^2 + bx + c = 0 to get the coefficients a,b,c, plug them into the discriminant.

## Ah of course

cheers =)

## (the answer's root 5, fact fans)

## ..

Or -root5. That's how they catch you out.

## oh of course

± root 5

Though in the question theres a diagram and the point (t,0) is in the positive direction of the x axis, so I dunno.

## ..

That's no excuse, unless it explicitly says either the solution is positive, or there's only one solution.

## Surely if the equation of the line

is y=2x the circle must be in the positive direction of the x axis?

## ..

No. It seems fairly obvious to me that there are at least two solutions, although the second one is not necessarily negative.

Frankly, the setup just seems to be a fancy way of saying "solve these simultaneous equations" - just remember that it's maths, not physics, so there are no unphysical solutions, and not giving one of them is a good way to drop an easy point.

## Woah

I have no idea how that works. how can a line perpendicular to y = 2x not pass through the x axis in the positive direction? far out.

## ..

I was wrong because I was forgetting the the circle has radius 2. That'll learn you for listening to me.

I stand by my point that it's worth stating that there are two solutions, though.

## yeah ill remember for tomorrow

thanks

## ..

If you care any more, here's a diagram.

http://i189.photobucket.com/albums/z134/determinist/answer-1.jpg

## :(

I am completely failing this exam tomorrow. I am ridiculously upset right now.

## about as advanced

as your face!

## *kicks you in your face!*

I am really worried about this damn exam but I just can't study. I don't remember anything, even though I spend half my time studying for it!

## Good luck!

I have my first tomorrow as well. Sociology - Methods. Easy, but I don't really want to do it.

## AQA?

I don't like that board. They don't post out results.

## Yep.

I like them. They post the mark schemes on their website from previous exams. Really helpful.

## Yeah that's good...

here:

http://www.chrisgardner.clara.net/sls1/tests/mthtstmen.htm

Very helpful.

## Thanks!

To be honest I'm alot more worried about the Poverty paper. I can't remember anything of what we've been taught. :s

## I didn't do poverty,

I did Education, and Family And Households.

## My first A2 is

One june 11th

I got my history coursework back today and had full marks and now feel worryingly complacent :(

## Someone

recommend me something to listen to, on the bus to school.

Something calming probably, but yeah:

GO!

## Listen to the soundtrack to 8 Mile.

And have a rap battle during the exam.

## :D

## Matta fact, dogg

Here's a pencil

Go home, write some shit, make it suspenseful...

What an ingenious rhyme.