Subtract -5x2 + 10x – 1 from 6x2 – x + 3.

10 + 9x

 6(2) - x + 3

- 5(2) + 10x

        =

 12 - x + 3

- 10 + 10x

        =

  15 - x

-  10 + 10x

15 - x - 10 + 10x

= 10 + 9x

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