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Alina [70]
1 year ago
12

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

Mathematics
1 answer:
Scorpion4ik [409]1 year ago
3 0

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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