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Math Help - rational roots of a function

  1. #1
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    rational roots of a function

    How can I find the values for ψ that the following sqaure root equals to a rational number?:
    √(87600-1.44ψ^2)

    Also, I don't want ψ to be greater than some value, e.g. 10. What's the procedure to find the answer?
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  2. #2
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    (wrong thread title, not roots but values).
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