A= [-3 5 -6
9 -5 3]
B=[ -2 6 7
2 -1 6]
-3A = [ 9 -15 18 6B = [ -12 36 42
-27 15 -9] 12 -6 36 ]
-3A + 6B = [ 9 + -12 -15 + 36 18 + 42 = [ -3 21 60
-27 + 12 15 + -6 -9 + 36] -15 9 27 ]
