1.1)a3+8b3=(a+2b)(a2-2ab+4b2) 2)x2y-36y3=y(x-6y)(x+6y) 3)-5m2+10mn-5n2=-5(m-n)^2 4)4ab-28b+8a-56=4b(a-7)+8(a-7)=(4b+8)(a-7) 5)a4-81=(a2-9)(a2+9)=(a-3)(a+3)(a2+9)2.) a(a+2)(a-2)-(a-3)(a2+3a+9)=a(a2-4)-(a3-27)=a3-4a-a3+27=27-4a3.1)x-3y+x2-9y2=x(1-x)+3y(1-3y)=(x+3y)(1-x)(1-3y) 2)9m2+6mn+n2-25=3m(3m+2n)+(n-5)(n+5)=(3m+1)(3m+2n)(n-5)(n+5) 3)ab5-b5-ab3+b3=b5(a-1)-b3(a-1)=b3(b-1)(b+1)(a-1) 4)x2+10xy-25y2=-(x-5y)^2