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Mulitplying a matrice

  • Thread starter TonyC
  • Start date
  • #1
86
0
I understand the number of rows must equal the number of columns to multiply but:

Is it possible to find the product of this matrice?

AB if A= 0.....9..... -6
........ -2....-10......7

B= 7
....5
...-2
 

Answers and Replies

  • #2
Galileo
Science Advisor
Homework Helper
1,989
6
Yes, you can multiply a 2x3 matrix with a 3x1 matrix. The result will be a 2x1 matrix.

In general, you can only multiply a axb matrix with cxd matrix if b=c. The result is an axd matrix.
 
  • #3
86
0
Just so I have this straight:
(0)(7) + (9)(5) + (-6)(-2) = 57
(-2)(7) + (-10)(5) + (7)(-2) = -78

written:
57
-78

am I correct?
 
  • #4
86
0
or is it written: [57,-78] ?
 
  • #5
136
0
You can write it either way. Vertically, like you had it. Or horiz. with a T above the right parenthase. That is to indicate it is the transpose.
 
  • #6
86
0
Thank you very much!
 
  • #7
HallsofIvy
Science Advisor
Homework Helper
41,738
899
By the way- the singular of "matrices" is "matrix", not "matrice".
 

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