Question

Calcula el producto y reduce términos semejantes
(9mn-n)(b-m²n+n)

Answer 1

(9mn-n)(b-m²n+n)=9mn(b)-9mn(m²n)+9mn(n)+(-n)(b)+(-n)(m²n)+(-n)(n)
=9nmb-9(m^3)(n^2)+9mn^2-nb-m^2n^2-n^2