SOLUTION: a13 of matrix A if A = 2 -3 4 5 0 -6 7 2 -8 I am not sure of how to find it, i tried to do it but it does NOT make sense.

Algebra ->  Matrices-and-determiminant -> SOLUTION: a13 of matrix A if A = 2 -3 4 5 0 -6 7 2 -8 I am not sure of how to find it, i tried to do it but it does NOT make sense.      Log On


   

Question 246891: a13 of matrix A if
A = 2 -3 4
5 0 -6
7 2 -8
I am not sure of how to find it, i tried to do it but it does NOT make sense.
Found 2 solutions by dabanfield, Edwin McCravy:
Answer by dabanfield(803) About Me  (Show Source):
You can put this solution on YOUR website!
a13 of matrix A if
A =
2 -3 4
5 0 -6
7 2 -8
The matrix A has 3 rows and 3 columns. Each of the numbers in the matix has a unique row number and column number. a13 represents the number in row 1 and column 3. In this case that number is 4. In general aij is the number in the ith row and the jth column. For example a23 = -6.

Answer by Edwin McCravy(20055) About Me  (Show Source):
You can put this solution on YOUR website!
a%5B13%5D of matrix A if
A=%28matrix%283%2C3%2C+2%2C+-3%2C+4%2C%0D%0A5%2C+0%2C+-6%2C%0D%0A7%2C+2%2C+-8%29%29

I am not sure of how to find it, i tried to do it but it does NOT make sense.

Remember the word "arc" in a%5Brc%5D.  The r is for "row" and
the "c" is for "column".

Although the subscript of a%5B13%5D looks exactly like the
number thirteen, 13, it really means row 1 and column 3.  It would
be less confusing if they would put a comma between the 1 and
the 3 and write drawing%2830%2C30%2C-1%2C3%2C-1%2C3%2Ca%5B%221%2C3%22%5D%29, but that 
apparently is considered to be too much notation, so no comma is 
placed between the row number and the column number.

To indicate all the elements of a 3x3 matrix in the a%5Brc%5D notation:



Therefore the element a%5B13%5D is the element in row 1 and column
3 in the matrix   

%28matrix%283%2C3%2C+2%2C+-3%2C+4%2C%0D%0A5%2C+0%2C+-6%2C%0D%0A7%2C+2%2C+-8%29%29

is 4.

Edwin