1)=(m^3-m)-(n^2-n)=m(m^2-1)-n(n-1)=(m-n)(m^2-1)(n-1)
3)=(x^3-4x)+(3x^2-12)=x(x^2-4)+3(x^2-4)=(x+3)(x^2-4)
5)=x^2+10x+25-16=x^2+10x+9
7)9x^2-42x+49-25=9x^2-42x=24
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1)=(m^3-m)-(n^2-n)=m(m^2-1)-n(n-1)=(m-n)(m^2-1)(n-1)
3)=(x^3-4x)+(3x^2-12)=x(x^2-4)+3(x^2-4)=(x+3)(x^2-4)
5)=x^2+10x+25-16=x^2+10x+9
7)9x^2-42x+49-25=9x^2-42x=24