Question

(3b-5)(3b+5)



(3+x)(x-3)

Answer 1

Ответ:

$(3b-5)(3b+5)=3 ^2 b ^2- 5 ^2=9b^2-25\\(3+x)(x-3)=3x-9+x ^2-3x=-9+x ^2=x^{2} -9$

Объяснение:

Answer 2

(3b-5)(3b+5)=3b^2-25

(3+х)(х-3)=х^2-9