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Question

Using identities, evaluate 95 × 105.

A
9999
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B
9975
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C
9925
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D
9950
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Solution

The correct option is B 9975
95 can be written as 100 - 5 and 105 can be written as 100+ 5.
95×105=(1005)×(100+5) which is in the form (ab)(a+b) where a = 100 and b = 5.

We know that,(ab)(a+b)=a2b2
95×105=(1005)(100+5)=100252
=1000025
=9975

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