1. Palmerston North
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    05 Jun '06 08:30
    Work this out:
    (y+4)(y-7)(y+6)= (?)
    and if you are really smart, factorise:
    y3 - 54= (?)
  2. Joined
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    05 Jun '06 08:40
    (y+4)(y-7)(y+6)= 0
    for the value of y I chose.

    Is that what you were looking for?
  3. SubscriberAThousandYoung
    All My Soldiers...
    tinyurl.com/y9ls7wbl
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    05 Jun '06 08:471 edit
    Originally posted by Knight Square
    Work this out:
    (y+4)(y-7)(y+6)= (?)
    and if you are really smart, factorise:
    y3 - 54= (?)
    y^3+3y^2-46y-168 = ?

    Right?
  4. Standard memberXanthosNZ
    Cancerous Bus Crash
    p^2.sin(phi)
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    05 Jun '06 09:10
    Do we really need endless topics covering basic math?
  5. Joined
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    05 Jun '06 09:321 edit
    you probably meant y³ - 64 = ?

    but curiously enough (3.77976314968462)³= 54
  6. B is for bye bye
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    05 Jun '06 10:33
    Originally posted by XanthosNZ
    Do we really need endless topics covering basic math?
    How else will homework be completed?
  7. Palmerston North
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    06 Jun '06 05:44
    Originally posted by XanthosNZ
    Do we really need endless topics covering basic math?
    XanthosNZ is a kiwi just like me and us NZders do get Homework right?
  8. Palmerston North
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    06 Jun '06 05:46
    Originally posted by Knight Square
    Work this out:
    (y+4)(y-7)(y+6)= (?)
    and if you are really smart, factorise:
    y3 - 54= (?)
    Expand this:
    (y+4)(y-7)(y+6)
    and if you are really smart, evalute:
    y3 = 64, what does y =
  9. Palmerston North
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    06 Jun '06 05:51
    Originally posted by AThousandYoung
    y^3+3y^2-46y-168 = ?

    Right?
    Incorrect, I did get confuse with the '^', what does it mean? and I believe that is not needed for this. (I think)😕
  10. Standard memberXanthosNZ
    Cancerous Bus Crash
    p^2.sin(phi)
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    06 Jun '06 06:00
    Originally posted by Knight Square
    XanthosNZ is a kiwi just like me and us NZders do get Homework right?
    I do get homework. But I do it myself and even if I were to ask for help here I doubt most of you could manage to say anything useful.

    Also, AThousandYoung is right. Hope you fail.
  11. Palmerston North
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    06 Jun '06 09:37
    Originally posted by XanthosNZ
    I do get homework. But I do it myself and even if I were to ask for help here I doubt most of you could manage to say anything useful.

    Also, AThousandYoung is right. Hope you fail.
    What, you think this was my homework, now. XanthousNZ that is just for fun. And I am only 4th Form and this is 6th Form Maths, Level 2 XanthousNZ Level2.
  12. SubscriberAThousandYoung
    All My Soldiers...
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    08 Jun '06 09:07
    Originally posted by Knight Square
    Incorrect, I did get confuse with the '^', what does it mean? and I believe that is not needed for this. (I think)😕
    The ^ means that the next number is superscripted; exponents are superscripted.
  13. Standard memberPBE6
    Bananarama
    False berry
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    08 Jun '06 14:59
    Originally posted by Knight Square
    Work this out:
    (y+4)(y-7)(y+6)= (?)
    and if you are really smart, factorise:
    y3 - 54= (?)
    One interesting pattern to note that may be helpful for quick calculations in the future:

    (x+A)(x+B) = x^2 + (A+B)x + AB

    (x+A)(x+B)(x+C) = x^3 + (A+B+C)x^2 + (AB+AC+AB)x + ABC

    (x+A)(x+B)(x+C)(x+D) = x^4 + (A+B+C+D)x^3 + (AB+AC+AD+BC+BD+CD)x^2 + (ABC+ABD+ACD+BCD)x + ABCD

    etc...

    This pattern arises from the combinatoric process of selecting "n" x's and "m-n" constants from the factorization of a polynomial of degree "m". It's handy to remember, because it saves you making mechanical errors keeping track of all the x^2 and such.
  14. Standard memberuzless
    The So Fist
    Voice of Reason
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    08 Jun '06 15:511 edit
    Originally posted by Knight Square
    Work this out:
    (y+4)(y-7)(y+6)= (?)
    and if you are really smart, factorise:
    y3 - 54= (?)
    If you want a quick estimate of Y3-54=?

    just take the square root of 54 and divide by 2. The answer is usually accurate to 1 or 2 decimal places with small numbers like 54....3.67 in this case

    EDIT: welcome back PB6
  15. Standard memberPBE6
    Bananarama
    False berry
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    08 Jun '06 16:04
    Originally posted by uzless
    If you want a quick estimate of Y3-54=?

    just take the square root of 54 and divide by 2. The answer is usually accurate to 1 or 2 decimal places with small numbers like 54....3.67 in this case

    EDIT: welcome back PB6
    Good to be back! But I'm still going to lurk for a while. I just hate people in general, so I'm ramping up to full-blown posting.
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