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10 December, 15:17

What is a positive number that equals 30 when added to it squared

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  1. 10 December, 15:32
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    Answer: 5

    Step-by-step explanation:

    Let x represent the number, then

    x² + x = 30

    x² + x - 30 = 0

    (x + 6) (x - 5) = 0

    x + 6 = 0 x - 5 = 0

    x = - 6 x = 5



    not valid since the restriction is that x > 0 (a positive number)

    So, x = 5
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