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sleepyjess

  • 2 years ago

If f(x) = log2 (x + 4), what is f^−1 (3)? 0 2 4 8

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  1. sleepyjess
    • 2 years ago
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    @agent0smith

  2. kc_kennylau
    • 2 years ago
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    \[3=\log_2x+4\]solve for x

  3. sleepyjess
    • 2 years ago
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    how do you get that? it is the inverse

  4. kc_kennylau
    • 2 years ago
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    exactly

  5. sleepyjess
    • 2 years ago
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    but that isnt how you get to the inverse

  6. douglaswinslowcooper
    • 2 years ago
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    1/log2 (7)

  7. sleepyjess
    • 2 years ago
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    I know that I need to switch the x and y but that is as far as I got.

  8. kc_kennylau
    • 2 years ago
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    just the same, but my method is faster :P

  9. douglaswinslowcooper
    • 2 years ago
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    "Inverse" may mean reciprocal, as so x^-1 = 1/x but it may mean going from ln x to exp(x), for example. Something is wrong, as none of your options correspond to my thought.

  10. kc_kennylau
    • 2 years ago
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    inverse as in inverse function he means

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