Question

expand the suitable identity (2a+1)²​

Answer 1

Step-by-step explanation:

Identity : (a + b)^2 = a^2 + 2ab + b^2

Question: (2a+1)^2

where a = 2a and b = 1 as per the question.

So, (2a + 1)^2 = (2a)^2 + 2(2a)(1) + 1^2

= 4a^2 + 4a + 1

Therefore, the expansion of (2a + 1)^2 is 4a^2 + 4a + 1.

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Answer 2

(2a + 1 ) ^2                                         identity used -  (a + b ) ^2 = a^2 + b^2 +2ab

= (2a)^2 + (1)^2 + 2 * 2a * 1

= 4a^2 + 1 + 4a

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