Question

using identity, find the product of ( x-y/5-1)(x+y/5+1)

Answer 1

$<h4>Using identity :$
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x^2 - y^2 = ( x + y ) ( x- y )
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( x^2 - y^2 ) / ( 5^2 - 1 ^2 )

=> ( x^2 - y^2 ) / ( 25 - 1 )

=> ( x^2 - y ^2) / 24