Page 281. Credited answer is A.
Why is Option 2 also not sufficient by itself?
For all negative numbers < -3.
x^3 > -9
and for all negative number >= -3
X^3 < -9
So from info in Option 2 alone tooo, I can reach an answer about whether x < -3.
I'm not too sure what we are trying to prove but I'm guessing the question is asking whether x^3<-9
If so, in option to the choices are -3 <= x<0
If x = -3, or -27 the answer is yes -27 is less than -9
if x = -2 or -8 then the answer is no, -8 is not less than -9