Respuesta :

Answer:

a = ± 9

Step-by-step explanation:

a² = 81 ( take square root of both sides )

a = ± [tex]\sqrt{81}[/tex] = ± 9

a = - 9 or a = + 9

Since 9 × 9 = 81 and - 9 × - 9 = 81

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