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26 September, 12:53

The square of 9 less than a number is 3 less than the number. What is the number?

a) - 12 or 7

b) - 12 or - 7

c) - 7 or 12

d) 7 or 12

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Answers (1)
  1. 26 September, 14:49
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    Let the number be x, then (x - 9) ^2 = x - 3

    x^2 - 18x + 81 = x - 3

    x^2 - 19x + 84 = 0

    (x - 12) (x - 7) = 0

    x = 12 or 7
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