Diketahui g (x) =x+1 dan f (x) =x2+x-1 (fog) (1)

g(x) = x + 1
f(x) = x^2 + x -1
(f o g) (1)

g(1) =2
f(g(1)) = 2^2 + 2 - 1 = 5
Jadi, jawabannya 5