What will come in the place of question mark?

The pattern followed here is: In each row: The product of first and second digit of first number is added to the first number to get the second number. The product of 1 st and 2 nd digit of 2 nd number is subtracted from the 2 nd number to get the 3 rd number. In row 1, [(4 × 5) + 45] = [20 + 45] = 65, [65 - (6 × 5)] = [65 - 30] = 35 In row 2, [(5 × 4) + 54] = [20 + 54] = 74, [74 - (7 × 4)] = [74 - 28] = 46 Similarly, In row 3, [(6 × 3) + 63] = [18 + 63] = 81, [81 - (8 × 1)] = [81 - 8] = 73