Relax

Respuesta :

(6 - x) * (6 + x) - ( (2 - x) * (2 + x) ) =

6^2 - x^2 - ( 2^2 - x^2 ) =

36 - x^2 - ( 4 - x^2 ) =

36 - x^2 - 4 + x^2 =

36 - 4 =

32 square feet