Find the square of 2a + b.
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Square of (2a + b) :
⇒ (2a + b)2
⇒ (2a)2 + 2 × 2a × b + b2
⇒ 4a2 + 4ab + b2.
Hence, square of (2a + b) = 4a2 + 4ab + b2.
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