Oh I see, fair enough. Hmm, okay I will try and sort out if Sunday is possible-it's a hassle for me because then I will be travelling all the way from Parra to Hurstville cus I have DUX.
i thought that whatever condition applies with one graph also applies for the other e.g. for xsqrt(x-1) we ignore allt he negative values for y=x in the multiplication process