bantuannya ya.....yang bener jawabannya...jgn asal

[tex] {a}^{2} + {( \frac{1}{a} )}^{2} = 66 \\ {(a - \frac{1}{a} )}^{2} + 2 = 66 \\ {(a - \frac{1}{a}) }^{2} = 64 \\ a - \frac{1}{a} = + - 8[/tex]