Question

p-q =9and pq=36 , evaluate the p+q​

Answer 1

Answer:

p-q=9

pq=36

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

9^2=p^2+q^2-2×36

81=p^2+q^2-72

p^2+q^2=81+72

p^2+q^2=153

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

(p+q)^2=153+2×36

(p+q)^2=153+72

(p+q)^2=225

p+q=15