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17 August, 07:08

What's |4n-15| = |n|

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  1. 17 August, 10:35
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    n = 3, 5.

    Step-by-step explanation:

    |4n-15| = |n|

    Square both sides:

    16n^2 - 120n + 225 = n^2

    15n^2 - 120n + 225 = 0

    Divide through by 15:

    n^2 - 8n + 15 =

    (n - 3) (n - 5) = 0

    n = 3, 5.
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