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31 March, 20:40

Let f (x) = 2x-1. If 3f (a) = 15, what is the value of f (2a) ?

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  1. 31 March, 21:52
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    The answer is 7.

    f (a) = 2a-1, 3f (a) = 3 (2a-1) = 15 - > a=2 so f (2a) = f (4) = 7
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