(4x+9y)(4x−9y)

(1 point)
Responses

16x2−81y2
16 x squared minus 81 y squared

16x2+72xy+81y2
16 x squared plus 72 x y plus 81 y squared

8x2−18y2
8 x squared minus 18 y squared

16x2+ 72xy − 81y2