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Problem: A=[[1,2],[3,4]], B=[[2,-1],[-1,2]], 2A+3B [ Calculator, Method and examples ]

Solution:
Your problem -> A=[[1,2],[3,4]], B=[[2,-1],[-1,2]], 2A+3B

2 × A = 2 ×
 1 2 3 4
=
 2 4 6 8

3 × B = 3 ×
 2 -1 -1 2
=
 6 -3 -3 6

2 × A + 3 × B =
 2 4 6 8
+
 6 -3 -3 6
=
 2+6 4-3 6-3 8+6
=
 8 1 3 14

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