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2012–13 First Session MATH 1111 Linear Algebra Chapter one particular: Matrices and Systems of Equations

Protection of Section 1: Neglect Application a few in Section 1 . four. Skip ‘Triangular Factorisation' in Section 1 . 5.

A.

Solving Equations

1 .

We all have been familiar with fixing equations. Illustrate how the subsequent equations could be solved, after which raise and answer some theoretical and/or practical questions concerning the process of solution. (a) 3x 1 8

2 x x 1 (b) 1 2 3 x1 x2 5

(c) (d)

x some 5 x 2 thirty eight zero

x2 x4

W.

Systems of Linear Equations

(Ref: Areas 1 . 1 and 1 ) 2)

installment payments on your

Your first experience of solving systems of equations was probably to manage a system of two equations in two unknowns. May such equations always be resolved? Are there any unique cases?

1

3.

The machine mentioned in the earlier question is often called a two 2 system. What about n n systems in general? (Note: An m d system is a method consisting of meters __________ and n __________. )

four.

Solve the next systems of equations. (a)

x1 2 x2 x3 3 x2 x3 2 2 x3 8 x1 2 x2 x3 several (b) a few x1 x2 3 x3 1 2 x1 3 x2 x3 5

5.

Consider the previous problem again and answer this questions. (a) Which method is easier to fix? Why? (b) We declare the two systems are equivalent. Explain. (c) Identify 3 operations in the act of solving for the systems. (d) A system of linear equations can be represented by an augmented matrix. Illustrate while using systems in the last question. (e) How do the operations in (c) match row businesses on the corresponding augmented matrices?

2

6th.

A matrix is said to be in row echelon form if it satisfies the next conditions: The first non-zero admittance of a nonzero row must be ___, called a ______________. Apart from the 1st row, any kind of leading one particular must be within the ________ of the leading one particular in the previous line. Zero rows, if any kind of, must be ___________________________________.

It is said to be in decreased row echelon form if this furthermore satisfies the following: Any leading 1 should be the only ___________________ in the column.

7.

Which usually of the subsequent matrices will be in line echelon form? Which of them are in decreased row disposition form? (a) 1 0 0 0 0 1 0 0 0 0 1 1 1 zero 1 0 (b) 0 one particular 1 zero 0 0 zero 1

(c) 1 2 3 0

0 you 1 0 0 zero 1 0 1 0 1 1

1 0 (d) 0 0

1 two 0 0

0 zero 0 0

1 2 3 0

1 2 3 4

(e)

0 0 0 0

1 0 0 0

you 2 zero 0

one particular 2 zero 0

(f)

1 0 0 0

0 you 1 0

0 1 0 1

8.

How could we transform a matrix into 1 1 you Illustrate while using matrix 2 1 3 a couple of 1 5

lowered row disposition form by way of row operations? 1 1. 2

(Note: The process of employing row operations to transform a matrix into row disposition form is normally called _________________________, while that of transforming a matrix in to reduced row echelon kind is usually called ________________________. )

3

on the lookout for.

(a) Exactly how are row functions related to resolving systems of linear equations? (b) Make clear the meaning of (i) lead variables

(ii) free variables (iii) (in)consistent systems

15. An meters n system is considered (a) a great overdetermined program if ___________ (b) a great underdetermined program if ___________ (c) a homogeneous program if _______________________________________________

11. Demonstrate that (a) a homogeneous system is always consistent; (b) an underdetermined homogeneous system always has a nontrivial option.

C.

Functions on Matrices

(Ref: Areas 1 . several and 1 ) 4)

12. Give a few examples in daily life by which matrices can be handy.

4

13. Explain this is of the subsequent terms and notations. (a) scalar (b) vector as well as row vector / steering column vector (c) n

(d) m n matrix (e) (i, j)-entry (f) square matrix

(g) oblicuo matrix (h) upper/lower triangular in shape matrix

14. (a)...

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