Homework Help: algebra 2

Posted by brittany on Tuesday, March 17, 2009 at 9:32pm.

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+(B-A) 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, Tuesday, March 17, 2009 at 10:28pm
(-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, Wednesday, March 18, 2009 at 9:38pm
thanks soo much!!!that helps!

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