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January 30, 2015

January 30, 2015

Posted by **munir** on Wednesday, April 16, 2014 at 4:08am.

(3 x-4 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 x-4 5 )

(o 1 3 )

p/s : all the value above in one bracket ( )

- math (Matrix algebra) -
**Steve**, Wednesday, April 16, 2014 at 5:38amassuming you mean a determinant, and calling your matrix M, I get

|M| = 31-3x

So, if 31-3x = 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+x-4%2C+5}%2C{0%2C+1%2C+3}}+

substitute in x=2 if you just want the numbers.

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