math (Matrix algebra)
posted by munir on .
if (2 1 x+2 )
(3 x4 5 ) =25
(0 1 3 )
p/s : all the value above in one bracket ( )
a) find the value of x
b) hence ,find (2 1 x+2 )^1
( 3 x4 5 )
(o 1 3 )
p/s : all the value above in one bracket ( )

assuming you mean a determinant, and calling your matrix M, I get
M = 313x
So, if 313x = 25, x=2
The inverse can be seen at
http://www.wolframalpha.com/input/?i=inverse+{{2%2C+1%2C+x%2B2}%2C{3%2C+x4%2C+5}%2C{0%2C+1%2C+3}}+
substitute in x=2 if you just want the numbers.