Jawab:

izin coba jawab, mohon koreksinya yaa kalo salah :)

Penjelasan dengan langkah-langkah:

a. (f o g o h)(x) = f(g(h(x)))

--> g(x) = x - 4

--> g(h(x)) = x² + 2x + 4 - 4

--> g(h(x)) = x² + 2x

cari f(g(h(x)))

--> f(x) = 2x - 1

--> f(g(h(x))) = 2(x² + 2x) - 1

--> f(g(h(x))) = 2x² + 4x - 1

b. ( g o h o f)(x)

--> h(x) = x² + 2x + 4

--> h(f(x)) = (2x + 1)² + 2(2x + 1) + 4

-->           = 4x² + 4x + 1 + 4x + 2 + 4

--> h(f(x)) = 4x² + 8x + 7

cari g(h(f(x)))

--> g(x) = x-4

--> g(h(f(x))) = 4x² + 8x + 7 - 4

--> g(h(f(x))) = 4x² + 8x + 3