Question

(M-n-1) (m-n+1) cuanto es

Answer 1

Solucion:

$\left(m-n-1\right)\left(m-n+1\right)$ ⇒ Productos notables,

$mm-mn+1\cdot \:m-mn+nn-1\cdot \:n-1\cdot \:m+1\cdot \:n-1\cdot \:1$ ⇒ Simplificar,

$-2mn+m^2+n^2-1$

Saludos.