Question

If p-q= 9 and pq= 36, evaluate

I :- p+q
ii :- p²+q²

Answer 1

p-q = 9
(p-q)^2=9^2
p^2 + q^2 -2pq= 81
p^2+q^2 - 2×36 =81
p^2 + q^2 = 81 + 72
p^2 + q^2 = 153