Respuesta :

Answer:

9x^2 - 49y^2

Step-by-step explanation:

rspill6

Answer: 9x^2 - 49y^2

Step-by-step explanation:

(3x + 7y)(3x − 7y)

9x^2 -21xy + 21xy - 49y^2

9x^2 - 49y^2