Respuesta :

MisterBigBrain

Answer:

9

Step-by-step explanation:

9 x 9 = 81

wegnerkolmp2741o

Answer:

x = ±9

Step-by-step explanation:

x^2 = 81

Take the square root of each side

sqrt(x^2 ) = ±sqrt(81)

x = ±9

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good job