Question

3.If x=3+ √8 and y =3-√8 then 1/x² + 1/y² =?
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Answer 1

Answer:

1/(3+ √8)²+ 1/(3-√8)²

1/(9+8+6√8) + 1/(9+8-6√8)

1/(17+6√8) + 1/(17-6√8) (Using identity)

(17-6√8+17+6√8)/1 (By taking lcm and using identity)

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