(a+5)(a-7)=?(3x-1)(2x+7)=?(a-1)(a²-2a-1)=?

Question

(a+5)(a-7)=?
(3x-1)(2x+7)=?
(a-1)(a²-2a-1)=?

Answer 1

1)a^2-2a-35. 2)6x^2+19x-7. 3)a^3-2a^2-a-a^2+2a+1=a^3-3a^2+a+1