Question

(20mn+5)(-5+20mn) Ayudaaaaaaaaa​

Answer 1

RESOLVER:

$\left(20mn+5\right)\left(-5+20mn\right)$

$\left(20mn+5\right)\left(-5+20mn\right)=\left(20mn\right)^2-5^2$

$=\left(20mn\right)^2-5^2$

Simplificamos esta expresión  $\left(20mn\right)^2-5^2:400m^2n^2-25$

$\boxed{=400m^2n^2-25}$

$BUENA\:\:SUERTE$