tolong bantuannya ya.. trims

gof(x)= g(f(x)
=g(x^2 - 6x)
=-2 + akar((x^2 - 6x)+9)
=-2 + akar(x^2-6x+9)
=-2 + akar((x-3)(x-3))
=-2 + x-3
= x -5
Jawabannya C