calc help!

mhagen26

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Sep 29, 2020
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Find a formula for f(x), an exponential function such that f(2)=1/8 and f(-1)=8.

f(x)=?
 
Find a formula for f(x), an exponential function such that f(2)=1/8 and f(-1)=8.

f(x)=?
First, you have to determine what "an exponential function" means! Most likely your textbook takes it to mean something like a*b^x, but they might also write it as, say, a*e^(kx), or several other possibilities.

Whatever way you write it, there will be two parameters (a and b, a and k, ...) to find. Plug in x=2 and x=-1 to obtain two equations, then solve for the two parameters.

If that's not enough, please follow our guidelines so we can tell what help you need:

If you had shown some work, I would be able to direct my suggestions to your specific issues.
 
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