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The square of the sum of a number and five is eighty-one. Find the number.
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2 votes
The square of the sum of a number
and five is eighty-one. Find the
number.

User MhagnumDw
by
8.3k points

1 Answer

2 votes

Answer:

  • The number is 4 or - 14

Explanation:

Let the number be x.

The we have equation:

  • (x + 5)² = 81

Solve it for x:

  • √(x + 5)² = √81
  • x + 5 = ± 9
  • x + 5 = 9 or x + 5 = - 9
  • x = 4 or x = - 14
User Luckylooke
by
7.6k points
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