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Chapter 8
Section 8.1, Extension of Exercise 74 (page 641)
Prove that a line tangent to the parabola 
at the point (a, b) crosses the s-axis at 
.
Section 8.2, Extension of Exercise 71 (page 665)
Prove that a nondegenerate graph of the equation
is a parabola if AC = 0.
Section 8.6, Extension of Exercise 68 (page 697)
Let A, B, and C be vectors. Which
of the following make sense, and which do not? Give reasons for your answers.
(a) 
(b) 
(c) 
(d) 