ErinWeeks
  • ErinWeeks
Find the product AB, if possible.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
ErinWeeks
  • ErinWeeks
A= |dw:1378875758944:dw|
ErinWeeks
  • ErinWeeks
B= |dw:1378875810585:dw|
anonymous
  • anonymous
cross or dot?

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More answers

ErinWeeks
  • ErinWeeks
I dont know!
ganeshie8
  • ganeshie8
matrix multiplication eh ?
ganeshie8
  • ganeshie8
|dw:1378876202706:dw|
ganeshie8
  • ganeshie8
|dw:1378876223473:dw|
ganeshie8
  • ganeshie8
since number of rows of A = number of columns in B, AB is possible.
ganeshie8
  • ganeshie8
u knw how to multiply two matrices ?
ErinWeeks
  • ErinWeeks
i think i do but i tried but my answers didnt match with any of them possible so i need a quick memory lesson ! lol
ganeshie8
  • ganeshie8
okay ! let me walk u thru this problem real quick :)
ErinWeeks
  • ErinWeeks
okay i need you to walk me thru another one but its fractions and i cant get that one neither!
ganeshie8
  • ganeshie8
|dw:1378876381340:dw|
anonymous
  • anonymous
I hated multiplying matries XD . Was very confusing at first haha.
ganeshie8
  • ganeshie8
there is an easy trick to multiply :)
ganeshie8
  • ganeshie8
|dw:1378876518888:dw|
ganeshie8
  • ganeshie8
take 9 of those columns
ErinWeeks
  • ErinWeeks
okay so than itd be -8*9?
ganeshie8
  • ganeshie8
|dw:1378876558872:dw|
ganeshie8
  • ganeshie8
these are matrices, when i ask u take 9 of those column, u need to multiply 9 to each element
ErinWeeks
  • ErinWeeks
okay so itd be 18 & -36
ErinWeeks
  • ErinWeeks
& okay !
ganeshie8
  • ganeshie8
Yes, we will simplify later. First see wats happening when we multiply two matrices
ErinWeeks
  • ErinWeeks
okay so whats that mean?
ganeshie8
  • ganeshie8
|dw:1378876692503:dw|
ganeshie8
  • ganeshie8
take one of those column
ganeshie8
  • ganeshie8
|dw:1378876737389:dw|
ErinWeeks
  • ErinWeeks
so itd be -1*1 and -9*1 ?
ganeshie8
  • ganeshie8
Yes, next step u can guess :)
ErinWeeks
  • ErinWeeks
4*3 & 2*3
ganeshie8
  • ganeshie8
|dw:1378876796842:dw|
ganeshie8
  • ganeshie8
awesome !!
ganeshie8
  • ganeshie8
|dw:1378876829325:dw|
ganeshie8
  • ganeshie8
Now the last step. Add them together
ErinWeeks
  • ErinWeeks
add what the top with the top and bottom with bottom?
ganeshie8
  • ganeshie8
|dw:1378876875946:dw|
ganeshie8
  • ganeshie8
exactly !
ErinWeeks
  • ErinWeeks
18+2+12=32 -36+-9+6=-39
ganeshie8
  • ganeshie8
careful of the signs in first row
ErinWeeks
  • ErinWeeks
ohh i forgot the (-) so it'd be 28 sorry lol!
ganeshie8
  • ganeshie8
careful of the numbers also lol 18 -1+12=29 -36+-9+6=-39
ErinWeeks
  • ErinWeeks
im slow im having a slow moment its -1 .. the answer would be 29.. yea i just caught that lol!
ganeshie8
  • ganeshie8
|dw:1378877065148:dw|
anonymous
  • anonymous
Careful X) . These silly mistakes can cost you when you do matrix inverses X) .
ganeshie8
  • ganeshie8
yeah inverses are nasty !
ganeshie8
  • ganeshie8
u may use this method i showed u for multiplying ANY two matrices. Actually there are 4 different methods to multiply matrices. You will learn them when u goto uni :)

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