WBBSE – 2019

Solution:

Given that

p + q = √13

Squaring both sides, we get

( p + q )2 = 13

( p – q )2 + 4 pq = 13

( √ 5 )2 + 4pq = 13

5 + 4pq = 13

4pq = 13 – 5

4pq = 8

pq = 8/4

pq = 2

The required answer is ( a ) 2

 

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