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Question

Which of the following is/are quadratic surds?

A
23
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B
36
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C
49
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D
520
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Solution

The correct options are
A 23
C 49
Quadratic surds are the surds whose order is '2'
First is quadratic as it has order '2'
Second and fourth are not '2'
Third can be solved as
49 = 432 =23 which has order 2
and hence it becomes quadratic surd
So, 23 and 49 are quadratic surds

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