let x be the least number which when subtracts from 10424 gives a perfect square number. What is the least number by which x should be multiplied to get a perfect square?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 5
Nearest square to 10424 is 10404
x = 10424 - 10404 = 20.
Prime factor of 20 = 2 × 2 × 5
To make pairs one is missing.
To make 20 a perfect one needs to multiply the number by 5.