Average = (sum of the items) / (number of items)
Sum of the items = (3x + 1) + (x - 3) = 4x - 2
Number of items = 2
Average = (2x - 1)
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You cannot add 3x and 1. You can add 3x and x and get 4x though.
2x2+7/x1
2x+x+5+3x-6=6x-1
(3x+1)(2x+4) = 6x2+4+2x+12x = 6x2+14x+4
12x2 + 7x + 1 = 12x2 + 3x + 4x + 1 = 3x*(4x + 1) + 1*(4x + 1) = (4x + 1)*(3x + 1)