Question

find the value of p2+q2-2pq by 13-p+r-2q where p=-2, q=-3, r=4

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Answer 1

Answer:

p-q=3

Squaring on both sides, we get

p2+q2-2pq=9

Since it is given that,

p2+q2=29

So on putting value,

29-2pq = 9

2pq = 20

pq = 10

Answer : pq = 10

Answer 2

Answer:

1 is the answer

hope this will help you