sleepyjess
  • sleepyjess
If f(x) = log2 (x + 4), what is f^−1 (3)? 0 2 4 8
Meta-math
schrodinger
  • schrodinger
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sleepyjess
  • sleepyjess
kc_kennylau
  • kc_kennylau
\[3=\log_2x+4\]solve for x
sleepyjess
  • sleepyjess
how do you get that? it is the inverse

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kc_kennylau
  • kc_kennylau
exactly
sleepyjess
  • sleepyjess
but that isnt how you get to the inverse
anonymous
  • anonymous
1/log2 (7)
sleepyjess
  • sleepyjess
I know that I need to switch the x and y but that is as far as I got.
kc_kennylau
  • kc_kennylau
just the same, but my method is faster :P
anonymous
  • anonymous
"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.
kc_kennylau
  • kc_kennylau
inverse as in inverse function he means

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