Suatu set nombor 5, 12, x, 2x, 10 dan 18 mempunyai min h . Apabila setiap nombor itu ditambah dengan 3, min menjadi 6 per 5 h . Cari nilai x

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.