What is the smallest positive integer x, such that √392x is an integer?  Answers.
A) 2 B) 4 C) 7 D) 8 E) 14
For a perfect square, the powers of prime factors should be even. 392 can be broken up as 2^3 * 7^2. You just need 2 to be multiplied to this number so that the number finally becomes 2^4 * 7^2 which is a perfect square.   Therefore x = 2.   2nswer: 2
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What is the smallest positive integer x, such that √392x is an integer?