- 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....

- schrodinger

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- anonymous

1. 1

- anonymous

2.1i^2=-1

- Akshay_Budhkar

myininaya i wanted others to answer it.. lol!!!

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## More answers

- myininaya

oops i can delete

- myininaya

lol

- anonymous

myinaya can you take a look at my problem i had a couple days ago?

- myininaya

sure is it a quick one i have to go to bed

- Akshay_Budhkar

Raioner give the link.. even i will give a try

- Akshay_Budhkar

try answering it joe.. lol!!!

- anonymous

i feel like its a trap >.> lol

- Akshay_Budhkar

still answer no..

- anonymous

isnt the first one 1 and the second one -1? or am i not giving this problem the attention it deserves?

- myininaya

joe its not a trap

- Akshay_Budhkar

i made it look like a trap.. lol!! ur right

- anonymous

I don't really understand how it is tricky? This is just order of operations and complex numbers.

- anonymous

Alchemista, nothing is tricky to you!

- myininaya

lol
its not tricky
it wasn't meant for us people who have already passed algebra

- Akshay_Budhkar

well ppl can answer the second one as 1 too as Raioner did in the first reply... @Alchemista

- myininaya

yea raioner did a good job :)
go raioner!

- anonymous

i dont know what im doing up <.< i have class tomorrow morning >.>

- myininaya

i said gn and im still here

- anonymous

I haven't seen any linear algebra on here for a while

- Akshay_Budhkar

oh...

- anonymous

ive noticed too Alchemista, and it saddens me =/

- Akshay_Budhkar

you mean to say questions on linear algebra?? @Alchemista

- anonymous

yes

- anonymous

maybe during the fall semester it will pick up? maybe the actual Linear Algebra 18.06 thread will be alive?

- anonymous

i can only dream~

- anonymous

and there certainly isn't any abstract algebra stuff

- 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

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

i know its easy but u wanted a linear algebra problem lol

- myininaya

whats that matrix called a diagonalized matrix?

- myininaya

i cant remember the name

- anonymous

It is a diagonal matrix

- myininaya

ok lol

- 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

Had to prove it before I could use it anywhos.

- myininaya

ok i must really go to bed
gn

- anonymous

lates :)

- Akshay_Budhkar

gn.. meet you tomorro

- Akshay_Budhkar

joe u also leaving?

- anonymous

i really need to =/ i have less than 8 hours till class, gotta get some sleep >.<

- Akshay_Budhkar

oh ok...

- Akshay_Budhkar

bye...

- 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

how did myininaya factorize ths 25x^2-2576x+9904???

- anonymous

jesus O.o the polynomial is ridiculous

- anonymous

\[25x^{2}-2576x+9904\]

- anonymous

if it was me, i would have just went to wolframalpha.com to see what the roots are.

- Akshay_Budhkar

Raioner wants it ..... i would have done the same.. lol!

- anonymous

wait....9904...is that something squared? maybe.....

- anonymous

\[(x-4)(25x-2476)\]

- anonymous

nope its not.

- anonymous

how did you do that alchemista?

- Akshay_Budhkar

yup thats what she got... how did u do that Alchemista?

- 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

mathemagic...lolol i saw someone post this word yesterday.

- anonymous

o pellet yea ax^2+bx+c

- Akshay_Budhkar

yup she asked y mathematics was called mathemagic.

- anonymous

didn't even think of that. brilliant. Thanks man.

- anonymous

There actually is something called "mathemagics" well its someone who performs quick mental computations using mnemonic devices.

- anonymous

Thanks guys. time for bed.

- Akshay_Budhkar

mnemonic devices. whats that?

- anonymous

sounds interesting o.O i might have to google that sometime. Lates Raioner.

- anonymous

http://www.youtube.com/watch?v=M4vqr3_ROIk

- Akshay_Budhkar

joe less dan 7 hours left for ur class.. lol!!!

- anonymous

lol >.< no idea why im up :)

- anonymous

that was amazing o.O

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