Q.

The number which exceeds its positive square root by 12 is

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a

9

b

16

c

25

d

None of these

answer is B.

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Detailed Solution

Let the required number is xso, x=x+12⇒x-12=x ⇒x2-25x+144=0 ⇒x2-16x-9x+144=0 ⇒x=16 since x=9 does not hold the condition.
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The number which exceeds its positive square root by 12 is