17. a) y = x²-6x+4; б) y=8/x; в) y = √x +3.

17. a) $$y = x^2 - 6x + 4$$

б) $$y = \frac{8}{x}$$

в) $$y = \sqrt{x} + 3$$

Ответ: $$y = x^2 - 6x + 4$$, $$y = \frac{8}{x}$$, $$y = \sqrt{x} + 3$$