Please help, Write an recursive formula for a_na n ​ , the n^{\text{th}}n th term of the sequence 28, -14, 7, ...28,−14,7,

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.