# Exercises 21.8, page 604

1. Hyperbola

3. Ellipse

5. Hyperbola

7. Circle

9. Parabola

11. Hyperbola

13. Circle

15. None (straight line)

17. Hyperbola

19. Hyperbola

21. None (point at origin)

23. Hyperbola

25. Parabola: $V(\hspace{0.17em}-\hspace{0.17em}4\hspace{0.17em},\hspace{0.17em}\text{}0)\hspace{0.17em}:\hspace{0.17em}\text{}F(\hspace{0.17em}-\hspace{0.17em}4\hspace{0.17em},\hspace{0.17em}\text{}2)$

27. Hyperbola: $C(1\hspace{0.17em},\hspace{0.17em}\text{}\hspace{0.17em}-\hspace{0.17em}2)\hspace{0.17em};\hspace{0.17em}\text{}V(1\hspace{0.17em},\hspace{0.17em}\text{}\hspace{0.17em}-\hspace{0.17em}2\hspace{0.17em}\pm \hspace{0.17em}\sqrt{2})$

29. Ellipses; $C(5\hspace{0.17em},\hspace{0.17em}\text{}0)\hspace{0.17em};\hspace{0.17em}\text{}V(5\hspace{0.17em},\hspace{0.17em}\text{}\hspace{0.17em}\pm \hspace{0.17em}2\sqrt{2})$

31. Ellipse

33. Parabola

35. Hyperbola

Enter both functions (from quadratic formula).

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