Question 296607
(x^3y^-4z^-5)(x^-4y^-2z^9) = (x^3*x^-4)*(y^-4*y^-2)*(z^-5*z^9) = x^(3-4)*y^(-4-2)*z^(-5+9) = x^-1*y^-6*z^4 = z^4/(x*y^6)



Answer: (x^3y^-4z^-5)(x^-4y^-2z^9) = z^4/(x*y^6)