Question

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....

Answer 1

1. 1

Answer 2

2.1i^2=-1

Answer 3

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

Answer 4

oops i can delete

Answer 5

lol

Answer 6

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

Answer 7

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

Answer 8

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

Answer 9

http://openstudy.com/users/raioner#/users/raioner/updates/4e33937a0b8ba7b2da41d61e

Answer 10

try answering it joe.. lol!!!

Answer 11

i feel like its a trap >.> lol

Answer 12

still answer no..

Answer 13

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

Answer 14

joe its not a trap

Answer 15

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

Answer 16

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

Answer 17

Alchemista, nothing is tricky to you!

Answer 18

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

Answer 19

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

Answer 20

yea raioner did a good job :)
go raioner!

Answer 21

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

Answer 22

i said gn and im still here

Answer 23

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

Answer 24

oh...

Answer 25

ive noticed too Alchemista, and it saddens me =/

Answer 26

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

Answer 27

yes

Answer 28

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

Answer 29

i can only dream~

Answer 30

and there certainly isn't any abstract algebra stuff

Answer 31

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

Answer 32

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...

Answer 33

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

Answer 34

whats that matrix called a diagonalized matrix?

Answer 35

i cant remember the name

Answer 36

It is a diagonal matrix

Answer 37

ok lol

Answer 38

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.

Answer 39

Had to prove it before I could use it anywhos.

Answer 40

ok i must really go to bed
gn

Answer 41

lates :)

Answer 42

gn.. meet you tomorro

Answer 43

joe u also leaving?

Answer 44

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

Answer 45

oh ok...

Answer 46

bye...

Answer 47

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.

Answer 48

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

Answer 49

jesus O.o the polynomial is ridiculous

Answer 50

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

Answer 51

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

Answer 52

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

Answer 53

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

Answer 54

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

Answer 55

nope its not.

Answer 56

how did you do that alchemista?

Answer 57

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

Answer 58

There are many ways you can find the roots (factoring is one of them).
You can complete the square or use the quadratic formula.

Answer 59

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

Answer 60

o pellet yea ax^2+bx+c

Answer 61

yup she asked y mathematics was called mathemagic.

Answer 62

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

Answer 63

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

Answer 64

Thanks guys. time for bed.

Answer 65

mnemonic devices. whats that?

Answer 66

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

Answer 67

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

Answer 68

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

Answer 69

lol >.< no idea why im up :)

Answer 70

that was amazing o.O