secepatnya no 234 ya pakai jalanya

no 1
g(f(x))= x²-4x+7
f(x)=x-2
g(x-2)= x²-4x+7
g(x)= (x+2)²-4(x+2)+7
      = x²+4x+4-4x-8+7
      = x²+ 3 jawaban c

no 2
(f0g)(x)=4x+9
2(g(x)-5= 4x+9
2 (g(x)= 4x+9+5
2g(x)= 4x+14
g(x)= 4x+14/2
g(x)= 2x+7
g(-3)= 2(-3)+7
       = -6+7= 1 jawaban A

NO 3
f(g(-3)=??
g(-3)= √(-3)²+7
        = √9+7
        = √16
        = 4

(f0g)(-3)= 
f(x)= x/x-3
     = 4/4-3
     = 4/1
     = 4 jawaban B