Question

Can someone help me with matrices?

Answer 1

no :P

Answer 2

Can you help me with Question #42

Answer 3

LOL

Answer 4

What are the steps?

Answer 5

what's the difference between that and #41 ?
find the inverse then divide by the constant to get A
there are quite a few ways to find the inverse

Answer 6

i would help you, but I don't know the steps.

Answer 7

Well I need to solve #42 LOL

Answer 8

To find the inverse I use the identity matrix

Answer 9

Ya hero I know :D

Answer 10

How come you didn't just use tutor.com?

Answer 11

They dont know linear algebra

Answer 12

Yes they do, you just went to the wrong person

Answer 13

What did you get for the inverse of 4A ?

Answer 14

No thsy give you (4A)^-1

Answer 15

So I first divided by 1/4

Answer 16

and then I used the identity matrix thingy

Answer 17

rld, how come you don't just read the book?

Answer 18

no that is the last step!

Answer 19

LOL ok

Answer 20

dividing by 4 is last

Answer 21

I knew I was doing it wrong

Answer 22

My book never told me what to do lol

Answer 23

\[((4A)^{-1})^{-1}=4A\]then you can scalar divide by 4...

Answer 24

Hey i can help you.

Answer 25

am i allowed to help you?

Answer 26

LOL Thanks turing :D
How can u think while standing on ur head?

Answer 27

Guys turing beat u lOL

Answer 28

Go ahead I though rld had it from here since he know the identity matrix trick...

Answer 29

Turing cheated !! he answered before us

Answer 30

Turing is amazing!

Answer 31

:P

Answer 32

thought*

Answer 33

lol

Answer 34

ya i know what to do from here lol

Answer 35

i didnt read the question (anyways i dont know matrices as good as him)

Answer 36

lol ya thanks guys :D

Answer 37

thanks for thanking me as well

Answer 38

I know a very fast method to find the inverse of 2X2 matrices.

Answer 39

ok shoot

Answer 40

Ideally it takes me about 5 seconds ;)

Answer 41

http://tutorial.math.lamar.edu/Classes/LinAlg/FindingInverseMatrices.aspx
I'm guessing you're thinking theorem 4 on this page

Answer 42

Fool u will be able to help me I am not finished my work. I have another few hours of linear algebra. I am not going to bed for another few hours so like stick around LOL

Answer 43

ok so now u tell Fool to help.. cant i and turing help?

Answer 44

LOL the more the merrier

Answer 45

ya i know that shortcut

Answer 46

At least i know something

Answer 47

so y ou r telling me that... Akshay atleast i know something, not like you

Answer 48

Yep exactly that Turing :)

Answer 49

LOL No i feel stupid around u guys so like at least i know something

Answer 50

the maths u do is very difficult

Answer 51

rld, just post all your questions here so I can learn linear algebra before taking it

Answer 52

LOL Linear algebra is like easy once you get it. So like I only post one in like 15 questions

Answer 53

By the way, on tutor.com a guy named Ewain G. is the smartest person on there. He will help you with anything math related no matter how difficult.

Answer 54

gotta run guyz i have to got to the hospital

Answer 55

HUH????? @razor

Answer 56

In words the adjoint of a 2X2 matrix can be found by swapping the diagonal elements and changing the sign of the off-diagonals.

Answer 57

Alrighty fool

Answer 58

yea we were taught that in grade 12 @fool

Answer 59

lol I never learn that in grade 12

Answer 60

Wow great akshay I never passed my grade 12 :P

Answer 61

yea yea that is why u r in iit.. i passed that is why i am not in iit :P -_-

Answer 62

A = 1.00 2.00
3.00 4.00


Determinant

det(A) = 1.00 2.00
3.00 4.00
= -2

The Inverse Matrix of A is:

A-1 = -2.00 1.00
1.50 -0.50

Answer 63

ok Thanks Guys (espeially turing) for ur help gotta go study otherwse wont get to sleep tonite

Answer 64

Yes, you are right Akshay, now you have established that IIT takes poor students like me :P

Answer 65

LOL @FOOL

Answer 66

LOL

Answer 67

especially turing? i helped u as well.. 1+1=2

Answer 68

idk fight it out with turing

Answer 69

Of-course she will thank Turing, he is one with pic ;)

Answer 70

LOLL

Answer 71

LOL no cuz he is upside down

Answer 72

ok i need to change my pic!! :P

Answer 73

turing is feeling shy?

Answer 74

why is he not asnwering?

Answer 75

LOL Turing isnt shy

Answer 76

lol not fair akshay stop hitting on her:P She clearly likes Turing not us :P

Answer 77

how do you know?

Answer 78

ok i accept the face fool that we are FOOLS turing isn't :P

Answer 79

I am always sort of doing something else...
I just found what the person was missing in the problem is all

Answer 80

LOL Tuirng is very modest. turing they are just joking around. Dont even argue with them LOL

Answer 81

Turing is modest and we are jokers?

Answer 82

are u stressed

Answer 83

just because he has a pic?

Answer 84

That's mean Rld :P

Answer 85

K guys gottta go. Otherwise i wont have time to spend with my

Answer 86

my..

Answer 87

family and friends

Answer 88

LOl

Answer 89

Turing :P

Answer 90

LOL

Answer 91

Guys u r crazy

Answer 92

rld did u get your answre

Answer 93

jokers---> crazy

Answer 94

I seriously am not like that

Answer 95

No I am just a Fool ;)

Answer 96

Ask lana