Question

Cuanto es? (3ab-9b^2 )(3ab+9b^2 )=

Answer 1

Simplificar

(3ab−9b²)(3ab+9b²)

=(3ab+−9b²)(3ab+9b²)

=(3ab)(3ab)+(3ab)(9b²)+(−9b²)(3ab)+(−9b²)(9b²)

=9a²b²+27ab³−27ab³−81b4

=9a²b²−81b⁴