Question

Multiply Matrices Help!!! Find -5A+4B
A=[6 1 over -4 -6 over 7 -7] B=[-5 -1 over -3 -8 over 6 8]

Answer 1

thats addition of matrixes ... just multiply the scalar to all the elements .. then add the reslts

Answer 2

A=[6 1 over -4 -6 over 7 -7]
B=[-5 -1 over -3 -8 over 6 8]


-5A=[ 6(-5) 1(-5) over -4(-5) -6(-5) over 7(-5) -7(-5)]
+4B=[-5(4) -1(4) over -3(4) -8(4) over 6(4) 8(4) ]
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add em up

Answer 3

thats a very nice way of presenting the matrixes ... makes lining up the elements simple lol

Answer 4

I got 1 -4 over -9 -11 over 2 -12 on the first one and -20 -4 over -12 -32 over 24 32.
What do you mean by add them?