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anonymous

  • one year ago

Given the function f(x) = log4(x + 8), find the value of f−1(2). a. f−1(2) = 4 b. f−1(2) = 8 c. f−1(2) = 10 d. f−1(2) = 17

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  1. anonymous
    • one year ago
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    hi are you still on? i can help

  2. anonymous
    • one year ago
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    we need to find the inverse. do you know how to do that?

  3. anonymous
    • one year ago
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    don't i replace x with y and y with x?

  4. anonymous
    • one year ago
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    f(x) = log4(x + 8) y = log4(x + 8) x = log4(y + 8) Now solve for y from there. x = log4(y + 8) \[f-1(x) = -8 + 4^x\]

  5. anonymous
    • one year ago
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    now just plug in 2, what do you get?

  6. anonymous
    • one year ago
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    -8 + 4^2 4^2 = 16 -8+16 = 8 your answer will be B.

  7. anonymous
    • one year ago
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    do you need anymore help?

  8. anonymous
    • one year ago
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    if so close this question and post another one and invite me. please medal me though

  9. anonymous
    • one year ago
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    oh okay, thank you so so much! and yes, i do. is it okay if i post it separately? so incase any one else needs help, they can find it easier.

  10. anonymous
    • one year ago
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    yes awesome

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spraguer (Moderator)
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