Hi,

If X^2 >= 100 then it follows that X >= 10 or X<= 0. Is this statement true?

I'm aware that it would certainly be true if the second part was X>= 10 or X<= -10. But I suppose as X<= 0 is more general that X<= -10 (X<=-10 is a subset of X<=0) then it holds as being correct.

I am right in thinking this?

Sorry if this is in the incorrect sub forum...

Thanks!