Question

1 ) evaluate using suitable identities : (2a+7)(2a-7)​

Answer 1

Answer:

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Step-by-step explanation:

(2a−7)(2a−7)=(2a−7)2

using identity (a−b)2=a2−2ab+b2

(2a−7)2=(2a)2−2×2a×7+72

(2a−7)2=4a2−28a+49

Answer 2

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