Question

( 3 x y + 5 ) ( 3 x y - 3 )

Answer 1

Resolver.

3xy + 5
3xy - 3
-----------------------------
9x²y² + 15xy - 9xy - 15 =
9x²y² + 6xy - 15


Otra forma de hacer.

Aolicas productos notables

(x + a)(x - b) =
x² + (a - b)x + (a)(- b)

(3xy + 5)(3xy - 3) =
(3xy)² + (5 - 3)(3xy) + (5)(-3) =
3²x²y² + 2(3xy) + (-15) =
9x²y² + 6xy - 15