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11 November, 07:56

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

-12 or 7

-12 or - 7

-7 or 12

07 or 12

+5
Answers (1)
  1. 11 November, 08:08
    0
    Answer: D

    Step-by-step explanation:

    (x-9) ² = x-3

    (x-9) (x-9) = x-3

    x² - 9x-9x + 81 = x-3

    x² - 18x+81 = x-3

    x²-19x+84 = 0

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

    x=12 or 7
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