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Find the value of (a + 2b)2 - (a - 2b)2 1. 8ab2. 10ab3. 6ab4. 4ab |
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Answer» Correct Answer - Option 1 : 8ab Given: (a + 2b)2 - (a - 2b)2 Concept used: (a + b)2 = a2 + 2ab + b2 Calculation: ⇒ (a2 + 4ab + 4b2) - (a2 - 4ab + 4b2) ⇒ a2 + 4ab + 4b2 - a2 + 4ab - 4b2 ⇒ 4ab + 4ab ∴ 8ab. |
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