Answer: f-1x(fx2) answer = -f
f(2)= 2 answer 2f
f-1x1 answer f-1
What I understand is that if this are the three options that you put you should choose X2
Converting -4 to polar form gives
.
Then the 4th roots of -4 would be the numbers

where <em>k</em> is taken from {0, 1, 2, 3}.
So we have



