(gof)(x) = g[f(x)]
f(x) = x + 5
To find g[f(x)], we will simply substitute x by f(x) into g(x)
That is;
g[f(x)] = 3[f(x)] + 1 = 3 [x+5] + 1
=3x + 15 + 1
=3x + 16
Hence;
(gof)(x) =3x + 16
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