Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,812

1. For the square matrix

show that A (adj A) = |A|I

2. Find the inverse of

3.If

and, find B.4. If

show that A is an orthogonal, that is

.

5. Find the inverse of

6. Given two matrices where

and,verify

.7. Using matrices, solve the equations

x+y+2z = 4

2x-y+3z = 9

3x-y-z=2.

8. If the matrix A is fiven by

prove that it satisfies the relation

where I stands for the unit matrix of order 2.

9. If

and,prove that

.10.Express

as the sum of a symmetric and skew symmetric matrices.

A symmetric matrix is a square matrix if (i,j)th element of A is equal to (j,i)th element of A.

A skew symmetric matric is a square matrix if the (i,j)th element of A is equal to the negative of the (j,i)th element of A.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

Pages: **1**