1.

Find the value of (a + 2b)2 - (a - 2b)2  1. 8ab2. 10ab3. 6ab4. 4ab

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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