If f(x) = x-3 g(x) = 2x+5 find fog and gof

Answer 1

Do you mean
f(g(x)) and g(f(x)) ?

f(g(x)) = (2x+5)-3 = 2x + 2
g(f(x)) = 2(x-3) + 5 = 2x -1

Answer 2

how do you get the answer tho?