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31 December, 23:34

The sum of a whole number and its square is 90. Find the number

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Answers (2)
  1. 31 December, 23:44
    0
    -10 or 9

    Step-by-step explanation:

    Lets set it up like an equation

    x + x^2 = 90

    x^2 + x - 90 = 0

    Use abc-formula

    to find x = - 10 or 9

    We put this into the original equation and find that both answers fit the equation
  2. 31 December, 23:50
    0
    The number is 9.

    Step-by-step explanation:

    I've no idea how to show your work on this one, but here's my thought process:

    I know that 81 is 9², and that their sum is 90.
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