SOLUTION: Let A = [-2 9 ] and B = [4 1]. [ 4 5 ] [-2 6] a. Find 2A - B. b. Find BA.

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Question 62618This question is from textbook Applied College Algebra
: Let A = [-2 9 ] and B = [4 1].
[ 4 5 ] [-2 6]
a. Find 2A - B.
b. Find BA. This question is from textbook Applied College Algebra

Answer by venugopalramana(3286) About Me  (Show Source):
You can put this solution on YOUR website!
Let A = [-2 9 ] and B = [4 1].DO YOU MEAN....
[ 4 5 ] [-2 6]....ASSUMING SO
a. Find 2A - B.
2A = OMITTING BRACKETS...MULTIPLY EACH ELEMENT OF A WITH 2
-4,18
8,10
2A-B = ...........SUBTRACT EACH ELEMENT OF B
FROM CORRESPONDING ELEMENT OF 2A
-4-4,18-1
8+2,10-6
=
-8,17
10,4

b. Find BA.
4,1........*........-2,9
4,5........*........-2,6
BA=
4*-2+1*-2,4*9+1*6
4*-2+5*-2,4*9+5*6
=
-10,42
-18,66