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What number when multiplied by itself gives 6 more than 30 ?
  1. 5
  2. 6
  3. 4
  4. 6
Explanation

Let the number be x.


Given:  

x × x = 30 + 6  

⇒ x² = 36  

⇒ x = √36 = ±6

Answer: The number is 6 or -6

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