tolong saya 2 soal diatas.

1) f(x) = √x²-16/x-8

x-8 ≠ 0
x ≠ 8

Df = { x|x€R, x≠8 }

2) g(x) = x + 1. f(x) = x²+x-1

(f o g)(x) = f(g(x)) = f(x+1)
f(x+1) = (x+1)²+(x+1) - 1
f(x+1) = x²+2x+1 +x + 1 - 1
f(x+1) = x² + 3x + 1