Find the matrix A such that
A
- [1 0] = [-5 -4]
[-1 4] [7 12]
Hint: Let A =
- [a b]
[c d]
not looking for the answer just an explanation on where to start. Thanks
littlebu wrote:Find the matrix A such that
A[1 0] = [-5 -4]
[-1 4] [7 12]
. . . . .
stapel_eliz wrote:littlebu wrote:Find the matrix A such that
A[1 0] = [-5 -4]
[-1 4] [7 12]
Is the "A"off to one side meant to indicate multiplication, so the exercise is as follows?
. . . . .
If so, have you tried using the hint? (If yes, please reply showing your work so far.)
Also, have you yet learned about finding inverse matrices?
Thank you!
stapel_eliz wrote:Is the "A"off to one side meant to indicate multiplication, so the exercise is as follows?
. . . . .
littlebu wrote:Since AX=B
[a b] [1 0] = [-5 -4]
[c d] [-1 4]= [7 12]
so I get [a b] [-5 -4]
[-a+4c -b+4d][7 12]
littlebu wrote:Yea I went through and double checked it and came up with
4b = -4
a - b = -5
4d = 12
c - d = 7
stapel_eliz wrote:Please review how to multiply matrices. The method is demonstrated, with a little "movie", in the link provided earlier.
For instance, the top left entry of the product matrix should be the result of multipying the top row entries of A by the left column entries of X, to give you a(1) + b(-1), which you would then set equal to the top left entry of B, giving you a - b = -5.
littlebu wrote:That is what I did after reviewing the link.