Question

Positive square root of 81

Answer 1

`x \ \textgreater \ 0 \\ \\ x= √(81) \ \ \ | (...)^(2) \\ \\ x^(2)=81 \\ \\ x^(2)-81=0 \\ \\ (x-9)(x+9)=0 \\ \\ x-9=0 \ \vee \ x+9=0 \\ \\ \boxed{x=9} \ \vee \ x=-9 \\ot\in D`

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Answer 2

`√(81) = +/-9 \\ (-9)^(2) =81 \\ (9)^(2) = 81`
The square root of 81 is 9. Therefore, the positive square root of 81 is positive 9.

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