Mathematics
Grade10
Easy

Question

Find the solutions of equation x squared equals 81

  1. x equals plus-or-minus 9 √ 3
  2. x equals plus-or-minus √ 3
  3. x equals plus-or-minus 9
  4. x equals plus-or-minus 3 √ 3

The correct answer is: x equals plus-or-minus 9


    x squared equals 81
    Taking square root on both the sides of the equation, we get
    √ left parenthesis x squared right parenthesis equals plus-or-minus √ 81
    x equals plus-or-minus √ left parenthesis 9 squared right parenthesis
    x equals plus-or-minus 9

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