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# Matrix Binomials

Extracts from this document...

Introduction

Introduction

The goal of this portfolio assessment is to find an expression for Xn, Yn, (X + Y)n, [An, Bn, (A + B)n] in both questions whilst expressing them: Mn in terms of aX and bY. The purpose of this assessment is to find out how we can interpret matrix binomials using different values and similarities to find the pattern occurring. We’ve been given a general statement to express Mn in terms of aX and bY, to do so we must substitute a into matrix X to get a new matrix ‘A’, and b into matrix Y to get the new matrix ‘B’. The task given now is to see if the pattern really did work with other numbers, and to prove the general statement.

• Question 1

Let X =  and Y =. Calculate X2, X3, X4; Y2, Y3, Y4.

By considering integer powers of X and Y, find expressions for Xn, Yn, (X + Y)n.

Alright now to calculate X2, X3, X4; Y2, Y3, Y4, I will firstly show how these matrices are multiplied, and then I shall use my graphics calculator to do the rest. As doing so I will also look for a pattern trend in which I can use to relate to fine the expression Xn, Yn, (X + Y)n.

Middle

=

a

a = 0.25 or

= x

=

a

a = 0.25 or

= x

=

a

a = -0.25 or -

= -x

The value of a (-0.25) is multiplied by the matrix given,, which equals to  when multiplied by - (a). In this matrix I used a fraction instead of a decimal, simply because it’s easier to work with.

- RATIONAL NUMBER

a

a = -0.25 or -

= -x

=

a

a = 0.25 or

= x

=

a

a = 0.25 or

= x

=

a

a = 0.25 or

= x

=

a

a = 0.25 or

= x

=

For this type of number, the rational number, I used both negative and positive numbers. However the pattern is different, at first the sequence  has a multiple of 2 for the denominator.

a

a = √5

= √5 x

The value of a (√5) is multiplied by the matrix given,, which equals to  when multiplied by √5  (a). In this matrix I used a root 5 instead of a decimal, simply because it’s easier to work with.

+ IRRATIONAL NUMBER

a

a = √5

= √5 x

=

a

a = √5

= √5 x

=

a

a = √5

= √5x

a

a = √5

= √5x

=

a

a = √5

= √5x

=

a

a = -√5

=- √5x

As you may have noticed, I am using a negative number now.

- IRRATIONAL NUMBER

a

a = -√5

= -√5x

=

a

a = -√5

= -√5x

=

a

a =- √5

= -√5x

a

a = -√5

= -√5x

=

a

a = -√5

= -√5x

=

Whilst calculating this sequence I came to notice that every second matrix is an integer. I noticed that this pattern went from multiples of two to 10. Every second matrix is multiplied by 10.

However, knowing that the matrix A = aX

Conclusion

.

To find the general statement which expresses Mn in terms of aX and bY.

The general statement would be.

Now I am going to test the validity of the general statement found (Mn = An + Bn)

• a = 3, b = 4, n = 2

==

Or

==

• a = -3, b = -4, n=2

==

Or

==

• a = 0.5, b = -5, n=4

==

==

Now I shall discuss the scopes and limitations I encountered during this portfolio. I realized that I can not have the power (n) as a negative or as a fraction or even as a root. Hence proving my point that the power can only be natural numbers. I will prove this right now giving 3 examples.

NEGATIVE

• a = 3, b = 2, n = -2

== this is not possible. Syntax error.

SQUARE ROOT

• a = 3, b = 2, n = √2

== this is not possible. Syntax error.

FRACTION

• a = 3, b = 2, n =

== this is not possible. Syntax error.

As you may have noticed I used the same numbers for the matrix because, no matter what number is inputted into the matrix you will get a syntax error, because the powers do not exist.

As I conclude this project I have shown all the working out, and I shown how the general statement is processed and I have also shown the different ways of which a matrix can be expressed whilst getting the same answer. The general statement is basically another way of showing how Mn = (A + B)n can be shown. This project was to strengthen out knowledge about matrix binomials and how they can be used in just simple sequences.

This student written piece of work is one of many that can be found in our International Baccalaureate Maths section.

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