agyemangocran16 agyemangocran16

08-05-2022
Mathematics

contestada

The square of a certain number plus ten is equal to 81

Respuesta :

Melody08 Melody08

08-05-2022

Answer:

x = ±8.43 (to 3sf)

Step-by-step explanation:

Let this number be x.

x² + 10 = 81

x² = 81 - 10

= 71

x = ±√71

= ±8.43 (to 3sf)

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