Either I am doing something wrong or this thing is not helpful at all?
Answer provided by our tutors
Most probably you are using 'x' as a symbol for multiplication and getting a strange solution.
Use the virtual keyboard to type multiplication symbol or your computers keyboard (the multiplication symbol is the asterisk * that you can type by pressing Shift+8):
This way you will get the following solution here:
3,500,000 = 3.5*10^6