Evaluate using identities
i) 95x96
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95 x 96
=( 100 - 5 ) ( 100 - 4 )
=( 100 )² + ( -5 -4 ) 100 + ( -5 ) ( -4 )
[ By using the identity ( x + a ) ( x + b ) = x² + ( a + b ) x + ab,
where x = 100, a = -5 and b = -4]
= 1000 - 900 + 20
= 9120
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