Question

102x 98 using identities

Answer 1

=102×98
=(100+2)(100-2)
[USING (a+b)(a-b) =a²-b²]
=(100)²-(2)²
=10000-4
=9996

Answer 2

Hi ,

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We know the algebraic identity

( a + b ) ( a - b ) = a² - b²

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Now ,

102 × 98

= ( 100 + 2 ) ( 100 - 2 )

By using above identity ,

= ( 100 )² - 2²

= 10000 - 4

= 9996

I hope this helps you.

: )