Hmm... I told you it didn't matter for the cube root. All values of x will fit in !

And t+4>0 ---> t> -4, not t>4

This is not a quotient.

x(x+3) has to be positive, that is to say if x is negative, then x+3 is negative. If x is positive, x+3 is positive.

This gives 2 possibilities. But I notice that it is quite difficult to give you only tips if you've never done it before... I hoped you would know

Try to understand this table please.

Try the reasoning above.

And indeed, -3 and 3 are not possible values

Unfortunately no... But it will come to the Truth lol