Answer:
Option A
Explanation:
We have ,f(x)=-3x-3
(i) let f(x)=3 , then we get
3=−3x−3⇒6=−3x⇒x=−2
(ii) Let f(x)=-6 , then we get
−6=−3x−3⇒−3=−3x⇒x=1
(iii) let f(x)=-9 , then we get
−9=−3x−3⇒−6=−3x⇒x=2
(iv) Let f(x)=-18, then we get
−18=−3x−3⇒−15=−3x⇒x=5
Thus, domain of f={-2,1,2,5}
Hence,-1 cannot be in the domain of f.