What is g (f) = 3k (2) -22 k=4 i can't get it

G (f) is just a variable, and that's what confuses most people. if you wanted to, the equation could still be the same and be written as:

x = 3k (2) -22 ;k=4

But, to get the answer, you substitute k as 4, shown below:

x = 3(4) (2) -22

Next you multiply:

x = 12 (2) -22

Then multiply 12 by 2:

x = 24 -22

Then subtract and the answer will be 2