diketahui f(x)=3x - 1 dan g(x)=x^2 + 1 maka (fog)(-1)=..

f (x) = 3x - 1
g (x) = x² + 1

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

fog (-1)
= 3x² + 2
= 3 (-1)² + 2
= 3 + 2
= 5