Question

simplify 100square -99square by ising identity​

Answer 1

Answer:

199

Step-by-step explanation:

The identity to be used here is:-

a²-b² = (a+b)(a-b)

=> 100²-99² = (100+99)(100-99)

=> 199*1 = 199

Hence, 199 is the correct answer.

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Answer 2

Step-by-step explanation:

1. 100×100 =10000
2. 99×99 =2800
3. 10000-- 2800 =7200