Question

find the value of √(81)-²

Answer 1

√( 81)-²

we know,
9² = 81 use, it

= √(9²)-²

= √( 9)^-2 × 2

= √(9)-⁴

= (9) ^-4 × 1/2

= ( 9)^-2

= 1/9²

= 1/81 answer

Answer 2

81 can be written as 9²
[(81)^-2]^0.5
=> [1/81^2]^0.5
=> [1/81] ^ 2*0.5
=> 1/81 ^1
=> 1/81 or 1/9² or 9^-2

Hope it helps.
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