Without delay, let's solve this. We've got 784 and we will be multiplying it by 3, that is, adding 784 to itself 3 times.
Step 1: 0 + 784 = 784
Step 2: 784 + 784 = 1568
Step 3: 1568 + 784 = 2352

So, 784*3 = 2352