In the following question, there is a certain relationship between given numbers on one side of (: :) and one number is given on another

In the following question, there is a certain relationship between given numbers on one side of (: 🙂 and one number is given on another side of (: 🙂 where another number is to be found from the given alternatives, having the same relationship with this number as the numbers of the given pair bear. Choose the best alternative. 7:81::6:64::12:?

1. 196
2. 144
3. 169
4. 225

Sol:

The correct option is A 196 x:(x+2)2