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14 August, 08:52

If the square of a positive integer is added to 55 times the integer, the result is 336336. find the integer.

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  1. 14 August, 09:00
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    The square of a positive integer added to 4 times the integer is 437 ...

    x2 + 4x = 437

    I chose to do this by completing the square ...

    x2+4x+4 = 437 + 4

    (x+2) 2 = 441

    Take square root of both sides

    x+2 = ±√441

    x = - 2 ± 21

    x = - 23 or x = 19

    x = 19
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