tolong jawab soal no 10 ya.. pakai cara

10)
i=3a(3b+7c)
9ab+21ac=9ab+21ac
betul
ii=(x-3)(x-3)
x²-9=x²-3x-3x+9
x²-9=x²-6x+9
salah
iii=(3p+2)(p-1)
3p²-p-2=3p²-3p+2p-2
3p²-p-2=3p²-p-2
betul

yang betul=i,iii

jawabnya B