Akshay_Budhkar
  • Akshay_Budhkar
A bit of tricky question on complex numbers.. try it guys for fun.. What are the answers to 1.√(-1 * -1) and 2.√(-1)*√(-1) a.1 b.-1....
Mathematics
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
1. 1
anonymous
  • anonymous
2.1i^2=-1
Akshay_Budhkar
  • Akshay_Budhkar
myininaya i wanted others to answer it.. lol!!!

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myininaya
  • myininaya
oops i can delete
myininaya
  • myininaya
lol
anonymous
  • anonymous
myinaya can you take a look at my problem i had a couple days ago?
myininaya
  • myininaya
sure is it a quick one i have to go to bed
Akshay_Budhkar
  • Akshay_Budhkar
Raioner give the link.. even i will give a try
Akshay_Budhkar
  • Akshay_Budhkar
try answering it joe.. lol!!!
anonymous
  • anonymous
i feel like its a trap >.> lol
Akshay_Budhkar
  • Akshay_Budhkar
still answer no..
anonymous
  • anonymous
isnt the first one 1 and the second one -1? or am i not giving this problem the attention it deserves?
myininaya
  • myininaya
joe its not a trap
Akshay_Budhkar
  • Akshay_Budhkar
i made it look like a trap.. lol!! ur right
anonymous
  • anonymous
I don't really understand how it is tricky? This is just order of operations and complex numbers.
anonymous
  • anonymous
Alchemista, nothing is tricky to you!
myininaya
  • myininaya
lol its not tricky it wasn't meant for us people who have already passed algebra
Akshay_Budhkar
  • Akshay_Budhkar
well ppl can answer the second one as 1 too as Raioner did in the first reply... @Alchemista
myininaya
  • myininaya
yea raioner did a good job :) go raioner!
anonymous
  • anonymous
i dont know what im doing up <.< i have class tomorrow morning >.>
myininaya
  • myininaya
i said gn and im still here
anonymous
  • anonymous
I haven't seen any linear algebra on here for a while
Akshay_Budhkar
  • Akshay_Budhkar
oh...
anonymous
  • anonymous
ive noticed too Alchemista, and it saddens me =/
Akshay_Budhkar
  • Akshay_Budhkar
you mean to say questions on linear algebra?? @Alchemista
anonymous
  • anonymous
yes
anonymous
  • anonymous
maybe during the fall semester it will pick up? maybe the actual Linear Algebra 18.06 thread will be alive?
anonymous
  • anonymous
i can only dream~
anonymous
  • anonymous
and there certainly isn't any abstract algebra stuff
myininaya
  • myininaya
ok here is an easy linear algebra problem: show that a n by n matrix with zeros everywhere except on the diagonal of the matrix has the diagonal entries as eigenvalues
Akshay_Budhkar
  • Akshay_Budhkar
if u want i can ask you guys some questions by tomorrow..But i believe the others must ask... We can ask them to ask such questions...
myininaya
  • myininaya
i know its easy but u wanted a linear algebra problem lol
myininaya
  • myininaya
whats that matrix called a diagonalized matrix?
myininaya
  • myininaya
i cant remember the name
anonymous
  • anonymous
It is a diagonal matrix
myininaya
  • myininaya
ok lol
anonymous
  • anonymous
i still havent answered that one problem i asked a while back. I was able to prove that if A is an invertible matrix with integer entries, and its inverse also has invertible entries, then the det A must be 1 or -1 (as per Alchemista's suggestion, thank you again). But i dont see how to use that fact to solve the problem.
anonymous
  • anonymous
Had to prove it before I could use it anywhos.
myininaya
  • myininaya
ok i must really go to bed gn
anonymous
  • anonymous
lates :)
Akshay_Budhkar
  • Akshay_Budhkar
gn.. meet you tomorro
Akshay_Budhkar
  • Akshay_Budhkar
joe u also leaving?
anonymous
  • anonymous
i really need to =/ i have less than 8 hours till class, gotta get some sleep >.<
Akshay_Budhkar
  • Akshay_Budhkar
oh ok...
Akshay_Budhkar
  • Akshay_Budhkar
bye...
anonymous
  • anonymous
is this your normal time frame? during the week i should be on around now for a while. Mondays are the only days where my sleep schedule is off lol.
Akshay_Budhkar
  • Akshay_Budhkar
how did myininaya factorize ths 25x^2-2576x+9904???
anonymous
  • anonymous
jesus O.o the polynomial is ridiculous
anonymous
  • anonymous
\[25x^{2}-2576x+9904\]
anonymous
  • anonymous
if it was me, i would have just went to wolframalpha.com to see what the roots are.
Akshay_Budhkar
  • Akshay_Budhkar
Raioner wants it ..... i would have done the same.. lol!
anonymous
  • anonymous
wait....9904...is that something squared? maybe.....
anonymous
  • anonymous
\[(x-4)(25x-2476)\]
anonymous
  • anonymous
nope its not.
anonymous
  • anonymous
how did you do that alchemista?
Akshay_Budhkar
  • Akshay_Budhkar
yup thats what she got... how did u do that Alchemista?
anonymous
  • anonymous
There are many ways you can find the roots (factoring is one of them). You can complete the square or use the quadratic formula.
anonymous
  • anonymous
mathemagic...lolol i saw someone post this word yesterday.
anonymous
  • anonymous
o pellet yea ax^2+bx+c
Akshay_Budhkar
  • Akshay_Budhkar
yup she asked y mathematics was called mathemagic.
anonymous
  • anonymous
didn't even think of that. brilliant. Thanks man.
anonymous
  • anonymous
There actually is something called "mathemagics" well its someone who performs quick mental computations using mnemonic devices.
anonymous
  • anonymous
Thanks guys. time for bed.
Akshay_Budhkar
  • Akshay_Budhkar
mnemonic devices. whats that?
anonymous
  • anonymous
sounds interesting o.O i might have to google that sometime. Lates Raioner.
anonymous
  • anonymous
http://www.youtube.com/watch?v=M4vqr3_ROIk
Akshay_Budhkar
  • Akshay_Budhkar
joe less dan 7 hours left for ur class.. lol!!!
anonymous
  • anonymous
lol >.< no idea why im up :)
anonymous
  • anonymous
that was amazing o.O

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