1.m^3+2m^2-9m-18 2.(x+1)(x+3)(x+5)(x+7)-9

1。m^3+2m^2-9m-18 =m^2(m+2)-9(m+2)=(m+2)(m^2-3^2)=(m+2)(m+3)(m-3) 2。(x+1)(x+3)(x+5)(x+7)-9 =[x^2+8x+7][(x^2+8x+7)+8]-9=(x^2+8x+7)^2+8(x^2+8x+7)-9=(x^2+8x+7+9)(x^2+8x+7-1)=(x+4)^2(x^2+8x+6)