What is the value of for x = 2 and y = -4

Your answer would be -9/-1 because 
-4 - 5 = -9
2 - 3 = -1

Hope I helped!
~ Zoe

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.