1. How did you get 4? I get domain error. > >
2. Ok ty.
I'd feel better if you were sure I was right for 3.
-4 is a constant number and if it is raised to an even power, it will become positive.. hence, if you take an even root, it is always defined.. i think, check out how you typed it on you gadget.. Ü
for number three, by definition,
but x^4 is always positive, hence you can write it simply x^4