Question

Разложите на множители:

12ab – 18b2;

21x7 – 7x4;

8x – 8y + ax – ay;

Answer 1

12ab-18b^2=6b*(2a-3b); 21x^7-7x^4=7x^4*(3x^3-1);  (8x-8y)+(ax-ay)=8(x-y)+a*(x-y)=(x-y)*(8+a).