Find the equivalent expression using the same basses. (21•28)^2

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b

a. is correct

in if you ask questions, the points are taken from your total and given to the one who answered it..

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happy to

i think u have 12 apples sorry again i don't really know if it correct i'm just tryna hrlp people out.