Question

Evaluate using suitableIdentities

1.(2a + 7) (2a – 7)
2. (b – 7)^2​

Answer 1

Answer:

1.(2a + 7) (2a – 7)

( a+b)(a-b)=a²-b²= (2a)²-7² = 4a²-49

2.(b-7)²

(a-b)²=a²-b²= b²-49

Step-by-step explanation:

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