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Mathematics
17 September, 09:29
If f (x) = log2 (x + 4), what is f-1 (3) ?
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Ellen Perkins
17 September, 09:46
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T = log2 (x+4)
2^t = x+4
x = 2^t - 4
So the goal is to set f (x) equal to new variable and express x depending on that variable. that is what f-1 (x) means
to find f-1 (3) we have to express 3 in our new function f (t)
f (t) = 2^3 - 4 = 4
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