- #1
mr_coffee
- 1,629
- 1
Hello everyone! Matrices fun! Anyways,
I'm trying to find a matrix that is equal to the idenity matrix if u multiply 2 matrices together. Well that matrix is the inverse So I'm trying to find the inverse but the answer is wrong:
A =
-5 3
2 -9
So i found the determinant and i switched the a and d, and negated the c and b . isn't htat the inverse?
1/35-6 = 1/29
-9 -3
-2 -5
-9/29 -3/29
-2/29 -5/29
isn't thtat the inverse of A?
I also have B =
-1 6
5 -30
I need to multiply that by some matrix C so the resultant matrix is
0 0
0 0
but i can't just say C is equal to
0 0
0 0
any ideas? thanjks!
I did notice, Row 1 is just 1/5 row 2
I'm trying to find a matrix that is equal to the idenity matrix if u multiply 2 matrices together. Well that matrix is the inverse So I'm trying to find the inverse but the answer is wrong:
A =
-5 3
2 -9
So i found the determinant and i switched the a and d, and negated the c and b . isn't htat the inverse?
1/35-6 = 1/29
-9 -3
-2 -5
-9/29 -3/29
-2/29 -5/29
isn't thtat the inverse of A?
I also have B =
-1 6
5 -30
I need to multiply that by some matrix C so the resultant matrix is
0 0
0 0
but i can't just say C is equal to
0 0
0 0
any ideas? thanjks!
I did notice, Row 1 is just 1/5 row 2