# ARGHHHH! MATHS...

jacktheoc
Posts:

**1,556**
For some stupid reason ive been put in top class for maths in my final year :evil:

ive been given 4pages of homework and its due in tomorrow! ive got a few questions if anyone can help

here goes:

simplify 6y*2 (squared)- 5y=0 divided by 9y*squared-4 :evil:

rearrange so x is the subject: y=b-9x*squared

factorise 6y*squared-5y-6

factorise: x*squared + 5x +4

solve: x*squared +5x +4=0

can anyone please help with this sh*t? :roll:

ive been given 4pages of homework and its due in tomorrow! ive got a few questions if anyone can help

here goes:

simplify 6y*2 (squared)- 5y=0 divided by 9y*squared-4 :evil:

rearrange so x is the subject: y=b-9x*squared

factorise 6y*squared-5y-6

factorise: x*squared + 5x +4

solve: x*squared +5x +4=0

can anyone please help with this sh*t? :roll:

0

## Posts

266second one is x=square root of (b-y/9)

third one is (3y+2) (2y-3)

fourth is (x+4)(x+1)

fifth is x=minus 4 OR x=minus 1

lovely maths - you should try a level maths - big step up by a long way...

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266second one is x=square root of (b-y/9)

third one is (3y+2) (2y-3)

fourth is (x+4)(x+1)

fifth is x=minus 4 OR x=minus 1

lovely maths - you should try a level maths - big step up by a long way...

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606couldjust give you the answers...... but then you wouldn't learn anything.It's quite hard to explain over the internet, as I don't know what sort of prior knowledge you have, but here's a few clues....

For the first one, you'll want to factorise both expressions, I'm guessing one of the terms will cancel out.

Rearranging isn't too tricky, you just need to get the x term on its own. Start off with 9x^2 = b-y and go from there.

Factorising is where you express it as (x+a).(x+b). There's a formula for it which I don't remember (try Google), but with a bit of practise you'll just be able to spot how to do it.

If you can factorise then solving is easy. There's sometimes two answers and they relate to the a and b terms in the factorising I mentioned above.

Done my good deed for the day....... good luck.

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176It's been over 23 years since I stopped doing maths.

I am considerably more rock and roll than you.

Road. Mountain. Up hill and down dale...

176I am considerably more rock and roll than you.

Road. Mountain. Up hill and down dale...

1,556too much hassle trying to type out all the questions so ive got a pic of the main ones which are slowly killing me!

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266indices (bottom left)

a) 1

b)one ninth (1/9)

c)2

and i think the top half of the equation is copied wrong, because that cannot be simplified...

the bottom half simplifies to (3y+2)(3y-2) (that is called the difference of two squares)

you can only cancel factors, so you need to factorise the top of the equation and then cancel out identical brackets or numbers next to brackets to get a simpler equation, which may be solvable.

i love maths.

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5,952Agree with Red though - quadratics are pretty basic stuff really.

We had the best maths teacher at GCSE - the entire top set took the exams early (about 8 months) and 2/3 of the class got an A (me included) - woo hoo!

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1,556nope havnt even started them... starting them after the october hols he said...

6021,5561,6354,228266a stone is dropped from the top of a tower. one second later another stone is thrown vertically downwards from the same point with a velocity of 14m/s. if they hit the ground together, find the height of the tower.

any ideas? im a bit stuck with it at the moment...

That is one of the first questions we have been set - and its going to get a lot tougher....

but its fun when you can do them.

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4,22811You could fit what you know into s=ut+1/2at^2 as s - the height of the tower is the same in both cases, from this you can find t and then substitue it back in to give you s.

There's most likely a more elegant way - but this ought to work.

enjoy!

sdg.

208Now that was a big jump up in difficulty.

Luckily my flat mate was a genius (average first year mark of 95%, average second year mark 88%, he got a first, then did a PHD in Maths) and he helped explain stuff to me. I was confused by:

i*squared = -1.

Something squared can not be a negative number - But by using some crazy equasions you can prove it to be true.

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266sdg_77thanks!!! made a simultaneous equation with t and (t-1) and solved that, then put t back in to get s... (23m)

i just needed a nudge in the right direction, so thanks!

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11In general mathematics problems can often be started off by writing out what you know in different formats - usualy one of these will provide the promt you need to get going.

sdg.