which is true about the completely simplified difference of the polynomials 6x^6-x^3y^4-5xy^5 and 4x^5y+2x^3y^4+5xy^5?

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.