 In this video, we present the solution to question number four from practice exam number one for math 1210 In which case we're given two functions f of x equals x squared plus 4 and g of x equals the square root of x minus 2 And we're asked to compute the composition g of f right here So if we're trying to compute g of f of x Function composition, what does this little circle here mean? It means you're putting the function f inside of g So this means g of f of x and the order of operations does matter f is the inside function The one on the right will be the inside function So we're gonna put inside of g the function x squared plus 4 because that's what f of x is and then that just means that in the Formula for g of x everywhere. We see an x. We're gonna substitute that with an x squared plus 4 So it gives us the square root of x squared plus 4 minus 2 so we can combine the like terms there We're gonna get the square root of x squared plus 2 Which then leads us to select option b