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

Meta-math
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\[3=\log_2x+4\]solve for x
how do you get that? it is the inverse

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Other answers:

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

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