1) (-6a - 2b)(6a - 2b); 2) (b^2 +v4)(b - 2)(b + 2).

1) (-6a - 2b)(6a - 2b)=-36a^2+12ab-12ab+4b^2=-36a^2+4b^2=4(b^2-9a^2)2) (b^2 +4)(b - 2)(b + 2)=(b^2+4)(b^2-4)=b^4-4b^2+4b^2-16=b^4-16