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7 November, 19:31

Which exponential function is represented by the table? f (x) = 2 (2x) f (x) = 0.8 (0.8x) f (x) = 2 (0.8x) f (x) = 0.8 (2x)

table

-2 0.2

-1 0.4

0 0.8

1 1.6

2 3.2

+1
Answers (1)
  1. 7 November, 19:46
    0
    The answer is the last option, f (x) = 0.8 * (2^x)

    The first strong indicator is that the fourth pair of data (0, 0.8) indicates that f (0) is 0.8

    Given that a^0 = 1, means that the coefficient of the function has to be 0.8 and you discard the first and the third options, because for them two f (0) = 2.

    AT the end what you have to do is to replace the values of x in equations and compare the results.

    So, for the fourt opion you get:

    x f (x) = 0.8 * (2^x)

    -2 0.8 * (2^-2) = 0.8 / 4 = 0.2

    -1 0.8 * (2^-1) = 0.8 / 2 = 0.4

    0 0.8 * (2^0) = 0.8 * 1 = 0.8

    1 0.8 * (2^1) = 0.8 * 2 = 1.6

    2 0.8 * (2^2) = 0.8 * 4 = 3.2

    As you can see this results are the same of the table of the question, so the function is f (x) = 0.8 (2^x).
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