Stare Hard Hard…

19 Apr

Now what is wrong with this!

a = n + d
a(a – n) = (n + d)(a – n)
a2 – an = an + ad – n2 – nd
a2 – an – ad = an – n2 – nd
a(a – n – d) = n(a – n – d)
a = n

Have fun! *grin*

9 Responses to “Stare Hard Hard…”

  1. Andrew April 20, 2005 at 1:02 am #

    I know the answer!!! you missed out the “-ad” on the Right-Hand Side of the equation! :)

    Reply
  2. inkyneil April 20, 2005 at 1:45 am #

    Hehe… wrong answer! The “-ad” was brought over to the left hand side of the equation. Try again! :P

    Reply
  3. junhui April 20, 2005 at 6:46 pm #

    cannot both sides x(a-n) because if a=n then (a-n) is 0?

    Reply
  4. Tigerming April 21, 2005 at 3:09 am #

    jun jun, you must at least identify yourself lah.. haha… not your real name but maybe how you came across this blog? else ppl would be wondering who you are? haha.. but hope you had fun. Ink often post stuff that stimulates your mind.

    Reply
  5. inkyneil April 21, 2005 at 3:13 am #

    Tigerming: Oh actually I figured out she was your sis coz she has a blog too and your parent’s pics are on it! :-D

    Junhui: Thanks for visiting my blog! How did you find it? :-D Anyway, you are 50% correct, i.e. you cannot multiply both sides with 0. However, you cannot immediately assume that (a – n) = 0 from the 2nd line. Look further down. :-P

    Reply
  6. Tiger April 21, 2005 at 12:29 pm #

    Probably this is a trick question haha… But if I was back in JC/sec a standard ans, I would put a condition in the 2nd line, (a-n) cannot = 0. then the last line, a = n, would not stand. Then I would add, if you should substitue all a’s for (n + d) and not just partially. And then you are just evaluating one side of the equation, expanding it and eliminating variables. haha… ok, I’m probably off haha. Tell us the answer if no one else tries to guess.

    Reply
  7. junhui April 21, 2005 at 6:03 pm #

    hmm…i just decided to explore gege’s friends blogs….quite a few interesting ones (including yours)

    I guess it’s the (a-n-d) was cancelled part. Coz the 1st line says a=n+d so (a-n-d)=0…. then a(a-n-d)=n(a-n-d) doesn’t give any info at all lor… =)

    Reply
  8. inkyneil April 22, 2005 at 2:32 am #

    Ladies and Gentlemen, we have a winner!

    Yup, that’s the correct answer. (a – n – d) = 0 and by cancelling that out on both sides, you have to divide both sides by (a – n – d), i.e. zero. However, we know that dividing anything by zero gives us infinity.

    Reply
  9. junhui April 22, 2005 at 4:29 am #

    hmm….winner? does that mean got prize one….*grinz*
    just joking =) quite fun actually….hope to see more posts-for-thought =)

    Reply

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