We have to look for the pattern in the numbers, so we can figure out what the next term in the sequence is !
It looks like, each number is multiplied by 2!
7 × 2 = 14
14 × 2 = 28
So, what's next?
28 × 2 = ?
The next term in the geometric sequence is ... 56!
I hope I helped :)
Comment if you have any confusion !