Explanation:
f(g(x)) simply means that you use the whole expression of g(x) as argument in f(x).
f(x) = 3x - 7/4
g(x) = 2x - 1
so,
f(g(x)) = 3(2x - 1) - 7/4 = 6x - 3 - 7/4
since 3 = 12/4, we get
f(g(x)) = 6x - 12/4 - 7/4 = 6x - 19/4
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