f(x) = 2x – 1
g(x) = x² + 3
(fog)(x) = f(g(x))
(fog)(x) = f(x² + 3)
(fog)(x) = 2•(x² + 3) – 1
(fog)(x) = 2x² + 6 – 1
(fog)(x) = 2x² + 5
f(x) = 2x – 1
g(x) = x² + 3
(fog)(x) = f(g(x))
(fog)(x) = f(x² + 3)
(fog)(x) = 2•(x² + 3) – 1
(fog)(x) = 2x² + 6 – 1
(fog)(x) = 2x² + 5