(1)-24*m^2*x-16*n^2*x=-8*x(3*m^2+2*n^2)
(2)x^2-1=(x-1)*(x+1)
(3)(xy)^(-1)=1/(xy)=(1/x)*(1/y)
(4)a^4x^2-a^4y^2=a^4*(x^2-y^2)=a^4*(x-y)*(x+y)
(1)-24*m^2*x-16*n^2*x=-8*x(3*m^2+2*n^2)
(2)x^2-1=(x-1)*(x+1)
(3)(xy)^(-1)=1/(xy)=(1/x)*(1/y)
(4)a^4x^2-a^4y^2=a^4*(x^2-y^2)=a^4*(x-y)*(x+y)