How do I multiply 2 matrices?

MYTUTOR SUBJECT ANSWERS

Answers / Maths / A Level / How do I multiply 2 matrices?

611 views

How do I multiply 2 matrices?

To multiply two matrices we need to name them A and B.

If for example we have 2 2X2 square matrices we know this will create a 3rd 2x2 martix

For this example we will use :

2 -1

3 4

and B:

5 0

-2 -2

To multiply these we complete this table:

(1st row of A X 1st column B) | (1st row A X 2nd column B)

---------------------------------------------------------------------------------------

(2nd row A X 1st column B )| (2nd row A X 2nd column B)

this therefore gives us :

(2X5)+(-1X-2) | (2X0)+(-1X-3)

-------------------------------------------

(3X5)+(4X2) | (3X0)+(4X-3)

resulting in the matrix AB=

12 3

7 -12

if you have trouble with this its easy to remmeber, multiply the rows by the columns

by doing this you can tell what order a matrix will come out as for example

a 2X2 matrix multiplied by a 2X1 matrix will give a 2X1 matrix as you are multiplying the rows of the first by the columns of the second.

Hope this helped, feel free to ask any questions for futher clarification

Ciara R. A Level Maths tutor, 13 plus Maths tutor, IB Maths tutor, 1...

1 year ago

Answered by Ciara, who has applied to tutor A Level Maths with MyTutor

Still stuck? Get one-to-one help from a personally interviewed subject specialist

324 SUBJECT SPECIALISTS

Praveenaa K. GCSE Further Mathematics tutor, A Level Further Mathema...

View profile

£20 /hr

Praveenaa K.

Degree: Mathematics (Masters) - Bristol University

Subjects offered:Maths, Science+ 4 more

“Top tutor from the renowned Russell university group, ready to help you improve your grades.”

5.0

8 reviews | 12 completed tutorials

Save profile

£36 /hr

Timothy N.

Degree: Architecture and Environmental Engineering (Masters) - Nottingham University

Subjects offered:Maths, Physics+ 2 more

“Hi there, I have a passion for helping students achieve, and believe that with my 200+ hours of experience, we will be able to surpass the grades you want!”

5.0

115 reviews | 241 completed tutorials

Save profile

£20 /hr

Maya B.

Degree: Mathematics with Physics (Bachelors) - Cambridge University

Subjects offered:Maths, Physics+ 1 more

“My approach is centred on deep understanding, and I constantly engage and encourage students to build both confidence and enthusiasm!”

5.0

2 reviews | 3 completed tutorials

Save profile

See more A Level Maths tutors

About the author

View profile

£20 /hr

Ciara R.

Degree: Electrical and Electronic Engineering MEng with industrial placement (Masters) - Newcastle University

Subjects offered:Maths, Spanish+ 6 more

“About Me: I am an Electrical and Electronic Engineering student at Newcastle University. I have a real passion for learning and love to teach and instil this in students too. I am very patient and have been a dance teacher since I w...”

MyTutor guarantee

Save profile

Version:	3.48.0
Build:	c981a57a9cf4
Time:	2017-07-24T15:36:26Z

MYTUTOR SUBJECT ANSWERS

How do I multiply 2 matrices?

Still stuck? Get one-to-one help from a personally interviewed subject specialist

324 SUBJECT SPECIALISTS

About the author

You may also like...

Other A Level Maths questions

One-to-one help is at your fingertips