Question

Use matries A and B. Find B-A, if you can.

A=[-5 4] B=[-2 7 -3]
[-8 2] [1 -6 0]

Answer 1

matrix subtraction is only defined if the two matrices are of the same size

so what is the size of A? the size of B?

Answer 2

@jim_thompson5910 so are they suppose to be equal?

Answer 3

how many rows does A have?

Answer 4

@jim_thompson5910 2. same with B. but B has 3 numbers in each row

Answer 5

so B has 3 columns

Answer 6

A is a 2x2 matrix

B is a 2x3 matrix

Answer 7

they aren't the same size (the columns don't match up), so B-A is not defined

Answer 8

so it is not possible?

Answer 9

no it's not

Answer 10

either B needs to have 2 columns

or

A needs to have 3 columns

Answer 11

for it to work out

Answer 12

@jim_thompson5910 ahhh okay thanks for your help

Answer 13

you're welcome