But what to do about the -3. Eg Do I say:

or

It seems that that it has to be x + 1 < -3 - works if look at curve graphically.

But then what if problem is

and which is wrong. Should be

and .

-4 < x < 2 - can see graphically that is under x axis and so between -4 and 2.

So what is the rule for bit when get square root of either side???