How do we go to the  the form, a number plus times it by the convex conjugate, is sub three minus four I, three minus four I, and what we get is three minus four I, over twenty five, eh, that sound reasonable to three twenty fifths, minus four twenty fifths high and that's  Q, I, and one over Z square  or the second bit, several ways to do this, what you can do is work out what the  square is first, so if I do a little aside Z square, it's three plus four I square, which is nine plus three forty five, twenty four I, plus sixteen I square, which is twenty four I, divide seven, who's that , so one over Z square is one over, minus seven plus twenty four I.