Same chapter3 marksDifficulty: Medium
Evaluate (997)2 using a standard identity.
Expansions
3 marksDifficulty: Medium
If x + 1/x = 5, find x2 + 1/x2.
Original Khojo Papers practice question — not from a past board paper.
Answer
23
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Squaring both sides gives x2 + 2 + 1/x2 = 25, so x2 + 1/x2 = 23.
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Same chapter1 markDifficulty: Medium
If x + 1/x = 3, then x2 + 1/x2 is:
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