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ARGHHHH! MATHS...

jacktheocjacktheoc Posts: 1,556
edited September 2008 in The Crudcatcher
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:

Posts

  • don't understand your first one

    second 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...
    Hardtails aren't called hardcore for no reason

    Giant STP: http://www.pinkbike.com/photo/1996804/
    Spesh Hardrock: http://www.pinkbike.com/photo/1996822/
  • don't understand your first one

    second 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...
    Hardtails aren't called hardcore for no reason

    Giant STP: http://www.pinkbike.com/photo/1996804/
    Spesh Hardrock: http://www.pinkbike.com/photo/1996822/
  • I could just 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.
    "The problem was, I was still using my eyes even though I had them shut"

    Demoted to commuting duty

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  • Perdoneme, no hablo las idiomas loco... :shock:

    It'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...
  • carlosthejackalcarlosthejackal Posts: 176
    edited September 2008
    Apologies for the double post, my connection's a tad flaky this evening....
    I am considerably more rock and roll than you.

    Road. Mountain. Up hill and down dale...
  • jacktheocjacktheoc Posts: 1,556
    ive been trying to learn them for the past few weeks, but am staying back tomorrow after school as ive finally given in and need the help :cry:
    too much hassle trying to type out all the questions so ive got a pic of the main ones which are slowly killing me!
    http://www.pinkbike.com/photo/2452877/
  • shape is 3 and five sixths (3 5/6) long

    indices (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.
    Hardtails aren't called hardcore for no reason

    Giant STP: http://www.pinkbike.com/photo/1996804/
    Spesh Hardrock: http://www.pinkbike.com/photo/1996822/
  • jacktheocjacktheoc Posts: 1,556
    thanks alot howsmyriding27 :D got another few test next week so i may be back :wink:
  • supersonicsupersonic Posts: 82,708 Lives Here
    zero divided by got me
  • redddraggonredddraggon Posts: 10,862
    You're in your "final year" and you can't do quadratic equations? Oh dear.........
    I like bikes...

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  • Surf-MattSurf-Matt Posts: 5,952
    Did further maths at A level then lots of it in my degree (Engineering) but forgotten too much of it! Good at mental arithmetic though.

    Agree 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!
  • redveeredvee Posts: 11,921
    Don't forget to give the gold star you get for this homework to thiose above who helped oyu :lol:
    I've added a signature to prove it is still possible.
  • mr_hippomr_hippo Posts: 1,051
    Why don't you post all of your homework on here? Others can do it for you and that will give you more time for cycling!
  • gazvenngazvenn Posts: 121
    bit dodgy if u just stick the answers down for that stuff like 80% of the marks for each question will be on the working out not the answer.
  • stumpyjonstumpyjon Posts: 4,069
    I gave up with maths at degree level (had to some degree level maths with the Chemistry). It all went blank for me when we got onto imaginary numbers (e.g. square root of -4 etc.) as if there aren't enough real numbers without having to make up some new ones :evil: .
    It's easier to ask for forgiveness than for permission.

    I've bought a new bike....ouch - result
    Can I buy a new bike?...No - no result
  • jacktheocjacktheoc Posts: 1,556
    You're in your "final year" and you can't do quadratic equations? Oh dear.........

    nope havnt even started them... starting them after the october hols he said...
  • Same with me when i did my GCSE's we only briefly touched on them in yr 10
    jacktheoc wrote:
    You're in your "final year" and you can't do quadratic equations? Oh dear.........

    nope havnt even started them... starting them after the october hols he said...
  • jacktheocjacktheoc Posts: 1,556
    yeh done them a little in yr10, but my maths teacher was completely useless so didnt really understand them too well!
  • Rich9Rich9 Posts: 1,635
    I gave up as soon as i saw the title of the thread. Maths and me dont get on too well.
    2014 Whyte T-129S
  • BlackSpurBlackSpur Posts: 4,228
    I've been going quadratics since year 8! Additional Maths GCSE this yeat then hopefully Furthe Maths A level next for me.
    "Melancholy is incompatible with bicycling." ~James E. Starrs
  • lol you should see a level maths that im doing at the moment - example q -

    a 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.
    Hardtails aren't called hardcore for no reason

    Giant STP: http://www.pinkbike.com/photo/1996804/
    Spesh Hardrock: http://www.pinkbike.com/photo/1996822/
  • BlackSpurBlackSpur Posts: 4,228
    I did that exact q as a practice last year! I can't remember how I did it though...
    "Melancholy is incompatible with bicycling." ~James E. Starrs
  • lol you should see a level maths that im doing at the moment - example q -

    a 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.

    You 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.
    FCN 8 (ish)
  • mtb.boymtb.boy Posts: 208
    I got an A at GCSE and then a B at Maths A level. Then I did Maths in the first year at Uni.

    Now 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.
    The first rule of cycling is - Tell everyone how great cycling is.

    The second rule of cycling is - Tell everyone how great cycling is !!!!
  • sdg_77


    thanks!!! 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!
    Hardtails aren't called hardcore for no reason

    Giant STP: http://www.pinkbike.com/photo/1996804/
    Spesh Hardrock: http://www.pinkbike.com/photo/1996822/
  • No Problem - 23m is what I got too.

    In 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.
    FCN 8 (ish)
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