Answer: 16
Explanation:
Firstly, we know that we are given a value of a=8 -----(1)
Also we are given b=4 ------(2)
Now, the expression given is (3b-a)^2
So, if we replace a and b with their given values, we get
=(3*4 - 8)^2
Now, by applying basic BODMAS rules, we get
=(12-8)^2
=4^2
=16