Question

If (a-1/a)=16 then find a²+1/a²

Answer 1

it was easy but good

Answer 2

(a-1/a)=16

squaring on both sides

a2 + (1/a)2 - 2×a×1/a= (16)2

a2+1/a2-2=256

a2+1/a2=256+2

a2+1/a2=258