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  1. The value of (2a + b)2 – (2a – b)2 is :
    1. 8ab
    2. –8ab
    3. 8a2 + 2b2
    4. 8a2 – 2b2
Correct Option: A

x2 – y2 = (x + y) (x – y)
∴  (2a + b)2 – (2a – b)2 = (2a + b + 2a – b) (2a + b – 2a + b)
= 4a × 2b = 8ab


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