Choose two of the numbers and repeat steps 1 to 5 do you get the same results

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.

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The answer is (a) 12-2(-1)(6)2(6)=12