(√(9+4√5)-√(9-4√5))^2

Question

(√(9+4√5)-√(9-4√5))^2

Answer 1

=9+4√5+9-4√5-2*(√9+4√5)(9-4√5)=18-2(9-16*5)=18+2*71=160

Answer 2

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