The degree of the polynomial p( x ) = x^7 −5x^3 − 3x^2 + 2x is

A. 7

B. 2

C. 3

D. 1

Answer is in the photo. I can't attach it here, but I uploaded it to a file hosting. link below! Good Luck!

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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