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21 July, 12:55

If f (x) varies directly with x2, and f (x) = 96 when x = 4, find the value of f (2).

A. 192

B. 72

C. 32

D. 24

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Answers (1)
  1. 21 July, 14:30
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    F (x) = k * x²

    f (4) = 96

    96 = k * 4²

    96 = 16 k

    k = 96 : 16

    k = 6

    f (2) = 6 * 2² = 6 * 4 = 24

    Answer: D) 24
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