I need help with linear algebra

Question

anonymous · Answer

attachment

amistre64 · Answer

we all do, its a shame how they present this stuff

anonymous · Answer

UMMM question #18 part D

amistre64 · Answer

thats way to blurry for me to read; or i need bifocals ... 50/50 lol

anonymous · Answer

lol hahaha ok i will resave it give me a sec

anonymous · Answer

attachment

anonymous · Answer

ok this one is better

amistre64 · Answer

yeah, much better; i feel young again :)

anonymous · Answer

hahah good

amistre64 · Answer

id d(A,B) the determinate of AB ?

anonymous · Answer

noo distance

amistre64 · Answer

im gonna have to look that up to be sure .... in the mean time, feel free to browse the gift shop :)

amistre64 · Answer

does this distance function have another name it goes by perchance?

anonymous · Answer

hmmmm

amistre64 · Answer

i keep getting "distance matrix" that has nothing to do with this problem

anonymous · Answer

finding distance btwn two vectors

amistre64 · Answer

how did you do it for #17?

anonymous · Answer

ummm i didnt i only have to do #18

amistre64 · Answer

got it, i think http://tutorial.math.lamar.edu/Classes/LinAlg/InnerProductSpaces.aspx

amistre64 · Answer

d(A,B) = ||A-B||

amistre64 · Answer

A-B

 1  -1
-1  1

anonymous · Answer

ohhhh i cld have given u the formula

amistre64 · Answer

your keeping secrets from me arent you; make him sweat is your plan .... ok

anonymous · Answer

but teh problem is the condition in the begginning

anonymous · Answer

how do u work that out

amistre64 · Answer

the inner product?  its pretty much self defined if you can read the notation

anonymous · Answer

cuz i know the answer for #17 part D it 3sqrt(6)

amistre64 · Answer

$a_{rc}$ tells us matrix A, row and column entry

anonymous · Answer

amistre i gtg but i will be back to check the answer

anonymous · Answer

Thanks :D

amistre64 · Answer

which in this case is 0

2*1.0 + 0.1 + 1.0 + 2*0.1 = 0

amistre64 · Answer

im gonna work and see if i can get that for #17 to see if im doing it right

amistre64 · Answer

got it ... maybe :)

#17

-1   3     0  -2
 4  -2     1   1

d(A,B) = ||A-B||

-1   5
 3  -3     ^2 and add the results

1+25+9+9 = 54  ; now sqrt them.

sqrt(54) = sqrt(9*6) = 3sqrt(6)

amistre64 · Answer

#18 would then be the same process ... 

A       B
10    01
01    10

A-B =  1 -1
           -1 1

^2 that parts, add and sqrt

1+1+1+1 = 4;  sqrt(4) = 2

anonymous · Answer

Thanks Amistre.  I was doing the same thing but somehow got my arithmetic wrong. Thanks again @amistre64