using a sutable identity evalute the following (99
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Heya!
(99)² can be written as (100-1)(100-1)
I.e., (100-1)²
which is in the form of (a-b)²
• (a-b)²=a²+b²-2ab
Here a= 100 , b =1
>> (100)²+(1)²-2(100)(1)
>> 10000+1-200
>> 10001 - 200
>> 9801 is the answer .
Hope it helps!
(99)² can be written as (100-1)(100-1)
I.e., (100-1)²
which is in the form of (a-b)²
• (a-b)²=a²+b²-2ab
Here a= 100 , b =1
>> (100)²+(1)²-2(100)(1)
>> 10000+1-200
>> 10001 - 200
>> 9801 is the answer .
Hope it helps!
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