For the subgroups inD4from part (b), write each subgroup in terms of a generating set. You only need to give one generating set per subgroup. Hint: each subgroup in part (b) canbe generated by either one or two elements. Find which subgroups are cyclic, then find which ones require two elements.

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.

Can u send a screenshot of it? !