Answer:
1. The value of B² is 81.
2. The value of ab+c is 10.
Explanation:
1.
We need to find the value of B².
The given information is

Taking square on both the sides.


Therefore the value of B² is 81.
2.
Given information: a = 2, b = 3, and c = 4.
We need to find the value of ab+c.
Substitute a = 2, b = 3, and c = 4 in ab+c, to find the value of ab+c.



Therefore the value of ab+c is 10.