Distribute and simplify the following:
(5m + 6)(m – 7)
(5m + 6)(m – 7) =

Step-by-step explanation:

=((5m+6)(m−7)(5m+6))(m)+((5m+6)(m−7)(5m+6))(−7)

=25m4−115m3−384m2−252m−175m3+805m2+2688m+1764

=25m4−290m3+421m2+2436m+1764

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