expresia (3+x)*(3-x)*(9+x²) se scrie prescurtat.....???

Răspuns :

(3+x)(3-x)=9-x^2
(9-x^2)(9+x^2)=9^2-X^4
(3+x)(3-x)(9+x²) = (9-x²)(9+x²) = 81-x⁴