Question

Need Matrices Help

Answer 1

is this for alegbra 1?

Answer 2

Algebra 2 actually

Answer 3

at connexus?

Answer 4

nope

Answer 5

some online school?

Answer 6

Yes

Answer 7

it is possible. answer is not C

Answer 8

How? it doesn't have the same number of columns and rows though

Answer 9

size convention: #rows x #columns

C = 3 x 2
A = 2 x 3

CA = [3 x 2] [2 x 3]

in line above, we can all the 2's beside each other the inner dimensions and the 3's the outer dimension.

For multiplication to be possible, the inner dimension must be the same [this is the case]
The dimensions of the product will be the outer dimensions. so in this case the answer is a 3x3 matrix.





assume we had

B = 1 x 8
D = 8 x 3

BD = 1 x 3 matrix
DB = impossible because inner dimensions would be 1 and 3

Answer 10

we can call *

Answer 11

Ohhhh Thank you so let me see

Answer 12

With multiplying would you take the first row from C to the first column of A

Answer 13

yes

Answer 14

would it be A?

Answer 15

what i like to do is to place A column above C

0 -2
-----
-3 1
5 -2
0 1

then i multiply down and add across

0 -2
-----
0 -2
0 +4
0 -2


this will be the first column of the product:

-2,4,-2

Answer 16

where did you get 4 from?

Answer 17

i did show my work ....

Answer 18

o_o its just that thats not one of the options for the answer

Answer 19

look for a column of -2,4,-2 not a row

Answer 20

sorry I am an idiot *facepalm*

Answer 21

i have a way i like to organize the information. if i dont do it this way i tend to misplace values and make a huge mess of it :)

Answer 22

Haha, Thank you. I need tr find a way to organize it to be neater :p

Answer 23

my teachers were always trying to take values and place them into formulas ... i would tend to take the right value and place it in the wrong spot is all