anmih

Verified answer

m^2n-n+mn^2-m = m(mn-1) + n(mn-1) = (m+n)(mn-1); 
m^5+m^3-m^2-m^4 = m^(3)(m^(2)+1)-m^(2)(1+m^(2)) = (m^3 - m^2)(1+m^2);X^4-x^3-x+x^2 = x^3(x-1) + x(x-1) = (x^3 +x) (x-1)
;