Problem 28-2

Solution wanted!

Exercise 28.5-7

Solution wanted!

Exercise 28.5-6

Solution wanted!

Exercise 28.5-5

Solution wanted!

Exercise 28.5-4

Solution wanted!

Exercise 28.5-3

Solution wanted!

Exercise 28.5-2

Solution wanted!

Exercise 28.5-1

If A is symmetric positive-definite matrix, then for any vector x ≠0, > 0. If we let x be the , we can get which is positive.