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**

** **

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** =

**5 + 4pq = 13**

**4pq = 13 – 5 **

**4pq = 8 **

**pq = 8/4**

**pq = 2 **

**The required answer is ( a ) 2**

** **