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1) -5a^2-10ab-5b^2
2) (x-y)^2+3(x-y)
3) a^5-a^3+a^2-1
4) 25-9m^2+6mn-n^2
1) -5a^2-10ab-5b^2
2) (x-y)^2+3(x-y)
3) a^5-a^3+a^2-1
4) 25-9m^2+6mn-n^2
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1) -5a^2-10ab-5b^2=-5(a^2+2ab+b^2)=-5(a+b)^22) (x-y)^2+3(x-y)=(x-y)(x-y+3)
3) a^5-a^3+a^2-1=a^3(a^2-1)+(a^2-1)=(a^2-1)(a^3+1)=(a-1)(a+1)(a+1)(a^2-a+1)=(a-1)(a^2-a+1)(a+1)^2