You took 2 in the first row, multiply it by 3 in the second row, that's correct to get 6 in the third row. Similarly, you took 3 from the second row and multiplied it by 11 in the first row, that's also correct to get 33 in the third row. Take 4 from the second row and multiply it with it 2 from the first row, similar to what you did for the coobooks and tada, answer.