Question

What are the difference between9²and 11²

Answer 1

Answer:

40

Step-by-step explanation:

it can be solved using the identity ,

   a²-b² = (a+b)*(a-b)

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here, a=11 and b=9

11²-9² = (11+9)*(11-9)=20*2 = 40                    

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hope it helps:)

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