= (4x^3y^4)/(-8xy^2)
simplify exponents by subtracting the denominator exponent from numerator exponent [x^(3-1)]
= (4x^3y^4)/(-8xy^2)
simplify -4/8 by 4 into numerator and denominator
= (-1x^2y^2)/2
= (-x^2y^2)/2
ANSWER: (-x^2y^2)/2
Hope this helps! :)