Respuesta :

julie0918
9

9x9= 81 hope this helps
aashish50

Answer:

81

=

9

⋅

9

then the square root of

√

81

=

9

.

Because the double multiplication for the same sign is always positive, the square root is also valid with the other sign

81

=

(

−

9

)

⋅

(

−

9

)

then

√

81

=

−

9

and we can say that

√

81

=

±

9

.

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