Find the determinant of the matrix?

3 ⤊

7 4
5 4

2007-08-25 05:44:29 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

det 2x2 matrix is
[a ...b]
[c....d]
det = a*d -c*b
inthis problem a= 7, b=4, c=5, d= 4

7*4 - 5*4= 28-20 =8

2007-08-25 05:48:08 · answer #1 · answered by Helper 6 · 3⤊ 0⤋

That's 7*4 - 5*4 = 28-20 = 8.
In general, the determinant of
a b
c d
is ad -bc.

2007-08-25 06:23:06 · answer #2 · answered by steiner1745 7 · 0⤊ 0⤋