tolong bantu masih belum ngerti kak jika f(x) = 2x²+1 dan g(x) = x+2 tentukan : a. (gof) (x) b. (gof) (5)

f(x) = 2x² + 1
g(x) = x + 2

A).
gof(x) = g(f(x)
gof(x) = g(2x² + 1)
gof(x) = (2x² + 1) + 2
gof(x) = 2x² + 3

B). gof(x) = 2x² + 3
gof(5) = 2(5)² + 3
gof(5) = 2(25) + 3
gof(5) = 50 + 3
gof(5) = 53