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26 January, 19:52

I am thinking of a positive number. If I square it, double the result, take half of that result, and then add 12, I get 21. What is my number?

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  1. 26 January, 21:41
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    Step-by-step explanation:

    work backwards.

    x^2*2/2+12=21

    x^2+12=21

    x^2=9

    x=3
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