Question

3x^2(x^3+5)
7x(x-4)-x(x-6)
(x-1)(3x-5)
a^4-a^3
8a^4b-36a^3b^6
2x(a+b)-y(a+b)
5(c-d)-m(d-c)
ay-3y-4a+12
x^2-4x-5
Помогите!