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28 January, 02:33

If f (x) varies directly with x2, and f (x) = 40 when x = 2, find the value of f (5).

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  1. 28 January, 05:39
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    For a simple, direct relationship, the general equation is f (x) = kx, where k is some constant and in these problems you have to find the value of k.

    f (x) = x^2

    If f (2) = 40 then f (5) = 100 because f (1) = 20
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