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13 March, 12:51

If f (x) = x + 5, for what value of x does f (4x) = f (x + 4) ?

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  1. 13 March, 16:27
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    x = 4/3

    Step-by-step explanation:

    To solve find f (4x) and f (x+4). You should get f (4x) = 4x + 5 and f (x+4) = x + 9. Now, set the two equations equal to each other.

    f (4x) = f (x + 4)

    4x + 5 = x + 9

    3x = 4

    x = 4/3
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