Use the expression 10m + 3 (n − 8) − 7 (m − 12) + 9n to find its simplified form and its factored form.

Select the expression when simplified and when factored from the choices below.
A 3m + 12n − 36
B 4 (n + 3m + 56)
C 3 (m + 4n + 20)
D 12n + 3m + 60

C 3 (m + 4n + 20)

Step-by-step explanation:

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