What value of n will make (-5) × (-8) = n × (-5) a true statement? a) (-8) b) 8 c) (-3) d) 3

to make the statement true, n need to equal the same as what is on the left side, so n = -8

correct answer is A

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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