Question

if p+q=^13 and p-q=^5, then the value of pq is

Answer 1

Hii There!!
Here is ur answer..


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Answer 2

if p+q=√13. ------>(1)
and, p-q=√5. --->(2)
now,

squaring both sides of both equations, we get

(1) eq. p^2 + q^2 + 2pq=13----->(3)
(2)eq. p^2 + q^2 - 2pq=5------>(4)

now, subtracting 4th eq. from 1st eq. we get

2pq = 8

.°. pq = 4

hence required answer is 4...

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