The Geniuses' Thread

Grindylow

Aoibheann wrote: »

I always knew it (as in I knew the order of priority!), but never as an acronym!

Noel, have a look here, it's an acronym for the order in which operations (like addition, multiplication etc) should take place.

EDIT: Also, a lot of people seem to have issues with the acronym as it seems to imply that Multiplication and Division are of a different priority (they're equally important, you just go left to right across whatever you're working out. Addition/Subtraction are similar, but of lower priority than M/D).

Ooh, I've never heard of that before..

I always just assumed you do the multiplication/division first..

Davidius

Use BOMA, thus ending the problem once and for all.

Duffy the Vampire Slayer

A friend of mine has gone mad into investing in stocks. Hes showing me his method now. This'll be me in a months time...

amacachi

Anyone looking to start a pension fund should lob into Petronas and Petrobras.

flyswatter

amacachi wrote: »

Anyone looking to start a pension fund should lob into Petronas and Petrobras.

Maybe invest in Libya when everything calms down. It's a goldmine. Bit of a mad idea but could well work.

Duffy the Vampire Slayer

No no no! I tell you, Asias economy has nowhere to go but up!

amacachi

flyswatter wrote: »

Maybe invest in Libya when everything calms down. It's a goldmine. Bit of a mad idea but could well work.

If I had money I'd have been buying BP stocks a while back, couldn't understand their price collapse. Your idea would be good if there was a way to know what companies will be getting contracts later.

Duffy the Vampire Slayer wrote: »

No no no! I tell you, Asias economy has nowhere to go but up!

Petronas is Malaysian, Petrobras is Brazilian, both are close to huge and growing markets. Short-term I'd be pushing into them and in a while move to the older oil companies.

Davidius

Economics and finance in general is quack witch doctor magic.

Pygmalion

I don't think the specifics matter, as TV always tells us, get-rich-quick schemes always work, and any incompetence in implementing them just makes it more hilarious, not less effective.

In particular the stock market is guaranteed money, who ever heard of the price of stock falling?

Duffy the Vampire Slayer

Never mind stock, property is a safe bet!

Grindylow

Sooo.. for any Mathsy people who may be here before 2ish.. >_>

Let u = 4+3i and w= 6-8i

Find the value of the real number k such that | u |= k | w |

Now I assumed | | = Square root?

But in the solution it goes:

| 4 + 3i | = k | 6 - 8i |

-> Square Root of 16 + 9 = k by square root of 36 + 64

Does that mean that | | means get rid of the imaginary numbers, square the number, and then square root the sum?

cocoa

Noel2k9 wrote: »

Sooo.. for any Mathsy people who may be here before 2ish.. >_>

Let u = 4+3i and w= 6-8i

Find the value of the real number k such that | u |= k | w |

Now I assumed | | = Square root?

But in the solution it goes:

| 4 + 3i | = k | 6 - 8i |

-> Square Root of 16 + 9 = k by square root of 36 + 64

Does that mean that | | means get rid of the imaginary numbers, square the number, and then square root the sum?

the absolute value, magnitude or modulus of an imaginary number denoted by || is the square root of the sums of the parts squared.

More simply, think of complex numbers geometrically with the imaginary axis where you might normally see the y axis (i.e., vertical), now the magnitude is simply the distance from the origin to the point in question, apply pythagoras' theorem and you're there

Grindylow

cocoa wrote: »

the absolute value, magnitude or modulus of an imaginary number denoted by || is the square root of the sums of the parts squared.

More simply, think of complex numbers geometrically with the imaginary axis where you might normally see the y axis (i.e., vertical), now the magnitude is simply the distance from the origin to the point in question, apply pythagoras' theorem and you're there

Oooh thank you

I hope it doesn't come up, it was up last year so it seems unlikely

marko93

For any maths people i need help

It says Solve for X the equation

(8^1/3)(4^1/4)=2^5-x

The ^ means to the power of..
Any help would be appreciated

Grindylow

marko93 wrote: »

For any maths people i need help

It says Solve for X the equation

(8^1/3)(4^1/4)=2^5-x

The ^ means to the power of..
Any help would be appreciated

(8^1/3)(4^1/4)=2^5-x

(2^3.1/3)(2^2.1/4) = 2^5-x


(3 x 1/3) x (2 x 1/4) = 5 - x

I think it's something like that?

I probably did it wrong, but I know you have to get them to common bases, then the powers become addition/subtraction

EDIT: What year in the exam papers is it?

marko93

Noel2k9 wrote: »

(8^1/3)(4^1/4)=2^5-x

(2^3.1/3)(2^2.1/4) = 2^5-x


(3 x 1/3) x (2 x 1/4) = 5 - x

I think it's something like that?

I probably did it wrong, but I know you have to get them to common bases, then the powers become addition/subtraction

I dont understand how to break down the numbers and fractions to get what i need

Grindylow

marko93 wrote: »

I dont understand how to break down the numbers and fractions to get what i need

What year in the exam papers is it and I'll take a look at my hardback?

marko93

It's OL...

Grindylow

marko93 wrote: »

It's OL...

I am OL :P

marko93

Noel2k9 wrote: »

I am OL :P

WIN
ehmmm, 2004 Q2 C(iii)

Davidius

Is it 2^(5-x) or 2^5-x = 32-x ?

If it's the former, you evaluate the left hand side to get 2^(3/2)

You get 2^(5-x) = 2^(3/2)

So 5-x = 3/2, solve for x.

For evaluating the left hand side:
8^(1/3) means the cube root of 8, i.e. the positive number y such that y^3 = 8, which is 2. Similar case for 4^(1/4) which is the square root of the square root of 4.

Grindylow

Ok I never did that...

@Davidius, it's

(8^1/3)x(4^1/4) = 2^5-x

mahblah

[LATEX]

8^{\frac{1}{3}}.4^{\frac{1}{4}}=2^{5-x}
[/LATEX]

[LATEX]
(2^{3})^{\frac{1}{3}}}.(2^{2}).^{\frac{1}{4}}}=2^{5-x}
[/LATEX]

[LATEX]
2^{1}.2^{\frac{1}{2}}=2^{5-x}
[/LATEX]

[LATEX]
2^{\frac{3}{2}}=2^{5-x}
[/LATEX]

[LATEX]
5-x=\frac{3}{2}
[/LATEX]

[LATEX]
x=\frac{7}{2}[/LATEX]

Grindylow

mahblah wrote: »

.

Legend!

I was close.. I got the first 2 lines right :pac:

QueenOfLeon

Oh hai computer genii. My laptop screen is flashing every time I click something, every few letters I type, and when I scroll down on pages etc. What's wrong?

shadowninty

Get a good OS

Grindylow

QueenOfLeon wrote: »

Oh hai computer genii. My laptop screen is flashing every time I click something, every few letters I type, and when I scroll down on pages etc. What's wrong?

Mmm is it a netbook? If so the wire yoke that connects into the screen could be outta place.. Same with a laptop I suppose..

QueenOfLeon

Noel2k9 wrote: »

Mmm is it a netbook? If so the wire yoke that connects into the screen could be outta place.. Same with a laptop I suppose..

Nope, its a laptop. Its strange, its not always the full screen, at the moment the forums bar across the top is flashing on and off and so is this line of text...but not the rest

Grindylow

QueenOfLeon wrote: »

Nope, its a laptop. Its strange, its not always the full screen, at the moment the forums bar across the top is flashing on and off and so is this line of text...but not the rest

Maybe all your pixels are dying.. that happened to mine and I had to get a new one grr

shadowninty

In all serious, it sounds like a hardware problem. Backup your crap and bring it to a repair place/ buy a new one (best option )