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How do you find AB if #A=[(4,3), (7,2)]# and #B=[(8,5),(9,6)]#?

1 Answer

Nov 13, 2016

#AB=((59,38),(74,47))#

Explanation:

#A=((4,3),(7,2))#

#B=((8,5),(9,6))#

#((a,b),(c,d))((e,f),(g,h))=((ae+bg,af+bh),(ce+dg,cf+dh))#

#AB=((4,3),(7,2))((8,5),(9,6))=((4*8+3*9,4*5+3*6),(7*8+2*9,7*5+2*6))#

#=((59,38),(74,47))#

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