Question

lf P+q = √13 p-q = √15 then the value of pq is-a) 2 (b) 18 (c) 9 (d) 8.​

Answer 1

Answer:

The value of pq is 2

a) 2

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

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