(а+3)(а-7)=а^2 - 7a +3a - 21 = а^2 - 4a - 21
(x-5)(x^2 +4)=x^3 + 4x - 5x^2 - 20
(3a^2-8) ( a^2-3a+1)=3a^4 + 24a -8 -9a^3 + 3a^2
5x(x-4)(x+6) = 5x(x^2 + 2x - 24)= 5x^3 + 10x^2 - 120x
(x+1)(3x^2 - 4x +10)= 3x^3- 4x^2 +10x +3x^2 - 4x+10
(а+3)(а-7)=а^2 - 7a +3a - 21 = а^2 - 4a - 21
(x-5)(x^2 +4)=x^3 + 4x - 5x^2 - 20
(3a^2-8) ( a^2-3a+1)=3a^4 + 24a -8 -9a^3 + 3a^2
5x(x-4)(x+6) = 5x(x^2 + 2x - 24)= 5x^3 + 10x^2 - 120x
(x+1)(3x^2 - 4x +10)= 3x^3- 4x^2 +10x +3x^2 - 4x+10