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

User Michael Pryor
by
5.1k points

1 Answer

9 votes

Answer:

x = ±8.43 (to 3sf)

Explanation:

Let this number be x.

x² + 10 = 81

x² = 81 - 10

= 71

x = ±√71

= ±8.43 (to 3sf)

User Ghis
by
5.7k points
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