Question

if p+q =10 and pq = 21 find 3(p²+q²).

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Answer 1

Answer:

(p+q)^2=p^2+q^2+2pq

100=p^2+q^2+42

p^2+q^2=100-42

=58

3(p^2+q^2)

=3×58

=174

Answer 2

Answer:

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