Question

If p and q are zeroesof polynomial x2_2x-8 then find thevalue of p2+ q2

Answer 1

p^2+q^2 = (p+q)^2-2pq
               = (-b/a)^2 - 2(c/a)
              =  (2/1)^2 - 2(-8)
              = 4 + 16 = 20 ;)

Answer 2

finally the answer is 20