Question

If p+q+r=7 and
p²+q²+r²

 =11.Find pq+qr+rp​

Answer 1

Answer:

p^2 + q^2 +r^2 = (p+q+r)^2 -2(pq+qr+rs)

11 = (7)^2 -2 ( pq+qr+rs)

11 -14= -2 (pq+qr+rs)

3/2 = (pq+qr+rs)

Answer 2

Answer:

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