anonymous
  • anonymous
which product is undefined?
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
1 Attachment
uri
  • uri
matrics?
anonymous
  • anonymous
yeah

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uri
  • uri
i don't get your question?
anonymous
  • anonymous
A. AB B. BA C. DB D. CD would these help
uri
  • uri
wait so like you're asking me to slove all this and tell you from this which one's are impossibe?
uri
  • uri
solve*
anonymous
  • anonymous
I think so :/ you see, the problem is, i dont know how to do it
amistre64
  • amistre64
matrix multiplication requires that the number of columns in the first one, matches the number of rows in the second one
uri
  • uri
Okay wait :3
amistre64
  • amistre64
|dw:1371047591398:dw|
anonymous
  • anonymous
so? BD ???
amistre64
  • amistre64
does B have a different number of columns then D has rows?
amistre64
  • amistre64
essentially, we need to be able to pair up vectors|dw:1371047676408:dw| if we cant pair up the vectors, we can perform the operations
anonymous
  • anonymous
For each multiplication, count the number of columns for the first table and the number of rows for the second table. If they are equal, the multiplication is valid. Otherwise the product it is undefined.
uri
  • uri
It's BA.
uri
  • uri
Option no.B
amistre64
  • amistre64
if we notate this in row,column format A=3,2 B=2,2 C=3,1 D=1,2 (r,c)(r,c) | | these numbers have to equal
amistre64
  • amistre64
CD = 3,1 1,2 is valid DB = 1,2 2,2 is valid AB = 3,2 2,2 is valid BB = 2,2 2,2 is valid i think thats all the valid ones
anonymous
  • anonymous
For the AB multiplication. A has 2 columns, B has 2 rows, so the multiplication is valid. You do the same thing for the rest.

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