Find the set A ∪ B′. U={1, 2, 3, 4, 5, 6, 7} A={2, 5, 6, 7} B={1, 6, 7}

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.