Posted by brittany on .
i need help with my algebra 2 homework, the section is called using matrices to represent data. here is one of the problems:
1/2A+(BA) A=[7 3 1 5]
[2 8 0 4] and
B= [6 0 11 3]
[5 2 8 9]
i don't know how to do this problem and the book doesn't have a problem like this for me to look at i don't know which to solve first and does it matter which part you solve first
i would really appreciate it if you could help, thanks!
brittany

algebra 2 
Reiny,
(1/2)A is a scalar multiplication
simply multiply each member of the matrix by 1/2
to add or subtract matrices, they must first of all have the same dimension.
then simply add/subract the corresponding members.
here is a nice short webpage, look at the top examples.
http://www.purplemath.com/modules/mtrxmult.htm 
algebra 2 
brittany,
thanks soo much!!!that helps!