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8 November, 08:23

Write the exponential function f (x) = - 2•3^ (1-x) in the form f (x) = ab^x

A) f (x) = - 2 (1/3) ^x

B) f (x) = - 6 (-3) ^x

C) f (x) = - 6 (-1/6) ^x

D) f (x) = - 6 (1/3) ^x

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Answers (1)
  1. 8 November, 08:50
    0
    The answer is D.

    Use guess and check:

    Sub in x=0 into both formulas

    y=-2 (3) ^1-0

    y=-2 (3) ^1

    y=-2 (3)

    y=-6

    y=-6 (1/3) ^x

    y=-6 (1/3) ^0

    y=-6 (1)

    y=-6
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