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Posers and Puzzles

Posers and Puzzles

  1. 05 Jun '06 08:30
    Work this out:
    (y+4)(y-7)(y+6)= (?)
    and if you are really smart, factorise:
    y3 - 54= (?)
  2. 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. Subscriber AThousandYoung
    It's about respect
    05 Jun '06 08:47 / 1 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 member XanthosNZ
    Cancerous Bus Crash
    05 Jun '06 09:10
    Do we really need endless topics covering basic math?
  5. 05 Jun '06 09:32 / 1 edit
    you probably meant y³ - 64 = ?

    but curiously enough (3.77976314968462)³= 54
  6. 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. 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. 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. 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 member XanthosNZ
    Cancerous Bus Crash
    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. 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. Subscriber AThousandYoung
    It's about respect
    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 member PBE6
    Bananarama
    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 member uzless
    The So Fist
    08 Jun '06 15:51 / 1 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 member PBE6
    Bananarama
    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.