2a = 2* (-4 -2 1) = (-8 -4 2)
-a+3c = - (-4 -2 1) + 3(4 -3 6) = (4 2 -1) + (12 -9 18) = (16 -7 17)
a+b+c = (3 -5 12)
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2a = 2* (-4 -2 1) = (-8 -4 2)
-a+3c = - (-4 -2 1) + 3(4 -3 6) = (4 2 -1) + (12 -9 18) = (16 -7 17)
a+b+c = (3 -5 12)