\"\"

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Given functions are \"\".

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To find \"f

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\"f     (Substitute \"\")

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\"equal                            (Evaluate powers: \"open)

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\"equal                                  (Add: 16 + 1 = 17)

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\"equal                                 (Substitute f(x) = 4x)

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\"equal                                       (Multiply: \"4)\"\"

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The value of \"\".