tolong bantuin tugas matematika???

f(x) = 2x² + 1
g(x) = x + 2

a. (g o f)(x) = g(f(x))
                   = g(2x² + 1)
                   = 2x² + 1 + 2
                   = 2x² + 3
b. (g o f)(1) = 2x² + 3
                   = 2×1² + 3
                   = 5
c. (f o g)(x) = f(g(x))
                   = f(x + 2)
                   = 2(x + 2)² + 1
                   = 2x² + 8x + 8 + 1
                   = 2x² + 8x + 9
d. (f o g)(1) = 2x² + 8x + 9
                   = 2×1² + 8×1 + 9
                   = 19