anonymous
  • anonymous
please help i got these questions wrong ! MEDAL!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
#1Can you multiply a 4 x 2 and a 3 x 4 matrix? Explain. Select one: a. Yes. You will end up with a 4 x 3 matrix. Incorrect b. Yes. You will end up with a 4 x 4 matrix. c. No. The matrices will result in a square matrix. d. No. The answer does not exist.
jim_thompson5910
  • jim_thompson5910
|dw:1437703074453:dw|
jim_thompson5910
  • jim_thompson5910
|dw:1437703089170:dw|

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anonymous
  • anonymous
so then i would be d right ? or am i wrong ?
jim_thompson5910
  • jim_thompson5910
if matrix A is 4x2 and matrix B is 3x4, then A*B does not exist. It is not possible to multiply this way
jim_thompson5910
  • jim_thompson5910
correct
anonymous
  • anonymous
awsome thankyou so much do you have time for the rest ?
jim_thompson5910
  • jim_thompson5910
how many more?
anonymous
  • anonymous
Two more
jim_thompson5910
  • jim_thompson5910
sure, go for it
anonymous
  • anonymous
#2 Which dimension determines the product matrix dimension? Select one: a. The inner dimensions b. The outer dimensions c. The cross-multiplied dimensions d. The first row of each matrix Incorrect
jim_thompson5910
  • jim_thompson5910
let's say we had matrix A be of size 3x2 and matrix B of size 2x7
jim_thompson5910
  • jim_thompson5910
A*B is defined because the inner dimensions match |dw:1437703383382:dw|
jim_thompson5910
  • jim_thompson5910
A*B would be 3x7 because these are the outer dimensions |dw:1437703430691:dw|
jim_thompson5910
  • jim_thompson5910
|dw:1437703487567:dw|
anonymous
  • anonymous
im a bit confused forgive me if i seem dumb but then wich one the product matrix dimension ?
jim_thompson5910
  • jim_thompson5910
A*B is considered the product matrix
jim_thompson5910
  • jim_thompson5910
3x7 is the dimension of A*B
jim_thompson5910
  • jim_thompson5910
3x7 ---> 3 rows, 7 columns
anonymous
  • anonymous
so it would be B outer dimensions?
jim_thompson5910
  • jim_thompson5910
yeah
anonymous
  • anonymous
alrighty i see your good ! heres the last
anonymous
  • anonymous
The product of a 3 x 3 and a 6 x 6 matrix would be: Select one: a. 3 x 6 Incorrect b. 6 x 6 c. 3 x 3 d. Does not exist
jim_thompson5910
  • jim_thompson5910
you tell me (hint: look at the first problem we went over)
anonymous
  • anonymous
ahh so d ?
jim_thompson5910
  • jim_thompson5910
why D?
anonymous
  • anonymous
mmmm isnt it because the inner dimensions do NOT match. They need to be the same number to multiply the matrices
jim_thompson5910
  • jim_thompson5910
correct, the 3 and 6 don't match so A*B doesn't exist
anonymous
  • anonymous
awsome thankyou so much for your help ! (:
jim_thompson5910
  • jim_thompson5910
glad to be of help

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