Question

Using a²-b²=(a+b)(a-b), find
i)61²-39²
ii)12.1²-7.9²

Answer 1

Answer:

Step-by-step explanation:

1)61²-39²=(61+39)(61-39)

             =(100)(22)

             =2200

2)12.1²-7.9²=(12.1-7.9)(12.1+7.9)

                 =(4.2)(20)

                 =84  

Answer 2

Answer:

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