Same chapter1 markDifficulty: Easy
The expansion of (a − b)2 is:
Expansions
2 marksDifficulty: Easy
Expand (3a − 5b)2.
Original Khojo Papers practice question — not from a past board paper.
Answer
9a2 − 30ab + 25b2
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Using (a − b)2 = a2 − 2ab + b2.
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Same chapter2 marksDifficulty: Easy
Evaluate 103 × 97 using a standard identity.
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Same chapter2 marksDifficulty: Easy
Expand: (2x + 3y)2.
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Same chapter3 marksDifficulty: Medium
If x − 1/x = 3, find x2 + 1/x2.
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Same chapter3 marksDifficulty: Medium
If x + 1/x = 5, find x2 + 1/x2.
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Same chapter3 marksDifficulty: Medium
Expand (a + b + c)2 and use it to evaluate (10 + 2 + 3)2 without direct multiplication.
Expansions