SOLUTION: let A = [3 -8 -5] [-4 -1 5] [-1 -9 -2] and B = [-4 -7 -1] [8 -1 8] [-3 -3 7] Find 2A

SOLUTION: let A = [3 -8 -5] [-4 -1 5] [-1 -9 -2] and B = [-4 -7 -1] [8 -1 8] [-3 -3 7] Find 2A - 4B.

Question 1005797: let A =
[3 -8 -5]
[-4 -1 5]
[-1 -9 -2]
and B =
[-4 -7 -1]
[8 -1 8]
[-3 -3 7]
Find 2A - 4B.
Answer by ikleyn(52787) (Show Source): You can put this solution on YOUR website!
.
Do it for each matrix element: calculate - for each pair of indexes [i,j], i = 1 ,2 3; j = 1, 2, 3.

Here is the element of the matrix A at the intersection of the i-th horizontal row and j-th vertical column.
Similar for .

For instance, = -8, = -7, and

- = 2*(-8) - 4*(-7) = -16 + 28 = 12.

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