Addition and Subtraction of Matrices (continued) and Equality of Matrices
How did you work go yesterday ? If you have any questions for me, either comment on the blog (only possible if you have a g-mail account) or send me an e-mail at brelmiranda@gmail.com
Someone checked with me as to whether we can work out sum 6(iii) - why can we not ? because one can only add or subtract matrices which are of he same order i.e. those which have the same number of rows and columns. The first matrix of 6(iii) is 2 x 3 matrix and the second is a 2 x 2 matrix - thus they are not of he same order and thus the addition cannot be worked out.
Today we would like to tackle the question of finding the value of an unknown element in a matrix.You should attempt Ex 12 (A) nos.2, 3 and 7
To find how to do this type of sum please go to pg.160 12.6 and example 1
How did you work go yesterday ? If you have any questions for me, either comment on the blog (only possible if you have a g-mail account) or send me an e-mail at brelmiranda@gmail.com
Someone checked with me as to whether we can work out sum 6(iii) - why can we not ? because one can only add or subtract matrices which are of he same order i.e. those which have the same number of rows and columns. The first matrix of 6(iii) is 2 x 3 matrix and the second is a 2 x 2 matrix - thus they are not of he same order and thus the addition cannot be worked out.
Today we would like to tackle the question of finding the value of an unknown element in a matrix.You should attempt Ex 12 (A) nos.2, 3 and 7
To find how to do this type of sum please go to pg.160 12.6 and example 1
- Note that if two matrices are equal, their corresponding elements are equal.
- Thus x - 2 = 0, therefore x = 2 and b + 1 = 5 so b = 5 - 1 = 4 and so on.
All the best !
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