Question

if A = 9+4 root 5 and b = 9-4 root 5 , then find the value of a square + b square​

Answer 1

(9+4√5)^2 + ( 9 - 4√5)^2

81 + 72√5 + 80 + 81 - 72√5 + 80

322 is the answer

Hope it helps