COLLEGE ENTRY EXAM 2morrow!! NEED HELP ASAP!?

Question:f(x)=x-5/2 g(x)=x^2-2x sub and solve with g=f((-1))
how do these questions work?! i got this from an example of the testing and all the questions are like this! i need help with the f(x) g(x) questions really bad it would be great for some help!! -this is the first time ive done this lol just so you know lol- :)

Answers:
solve f(x) with -1 as x then substitute the solution as the g in the other equation

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