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matrix A: -3 6 2 Matrix B: -1 8 -6
-4 -8 1 0 -3 -5
4 9 -3 -5 0 -4

multiply these matrices. I dont want you to just give me the answer, please try to explain

2006-11-07 07:09:41 · 2 answers · asked by krystal 6 in Education & Reference Homework Help

sorry i just realized how messed up that looks, thats not how i typed it, so let me try it again
matrix A first row -3, 6, 2
second row -4, -8 1
third row 4, 9, -3

Matrix B first row -1, 8, -6
second row 0, -3, -5
third row -5, 0, -4

hope this makes more sense

2006-11-07 07:17:22 · update #1

2 answers

the 3 x 3 matrix A times the 3 x 3 matix B will yield a 3 x 3 matrix AB

AB1,1 = (A1,1)(B1,1) + (A1,2)(B2,1) + (A1,3)(B3,1)
AB1,1 = (-3)(-1) + (6)(0) + (2)(-5) = -7

AB1,2 = (A1,1)(B1,2) + (A1,2)(B2,2) + (A1,3)(B3,2)
AB1,2 = (-3)(8) + (6)(-3) + (2)(0) = -42

AB2,1 = (A2,1)(B1,1) + (A2,2)(B2,1) + (A2,3)(B3,1)
AB2,1 = (-4)(-1) + (8)(0) + (1)(-5) = -1

etc.

2006-11-07 07:50:38 · answer #1 · answered by Eric 2 · 0 0

you mulitply the number in matrix A row 1 colum 1 with the number in matrix b row 1 colum 1.and so on.

example:-3 x -1=3

2006-11-07 07:23:41 · answer #2 · answered by ...new mommy:) 2 · 0 0

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