factorise 9^2-2+1/81
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9^2-2+1+1/81
=9^2-2/9^2
As ( 9^2 - 2 * 81* 1/81 + 1/9^2 )
so it is the formula of (a-b)^2
ANS=( 9^2- 1/9)^2
=( 81-1/81)^2
=9^2-2/9^2
As ( 9^2 - 2 * 81* 1/81 + 1/9^2 )
so it is the formula of (a-b)^2
ANS=( 9^2- 1/9)^2
=( 81-1/81)^2
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