Nik O.

asked • 11/07/16

Evaluate the function at the indicated value of x

Function Value
g(x) = logbx

x = b−7


cannot wrap my head around. can you help guys?

Andrew M.

Logarithms are basically "anti-exponents"
 
logab=n    means that n is the power to which I would raise a to
get the value b:   so if logab = n then  an=b
 
Your equation is g(x) = logbx where x=b-7
So you have g(b-7) = logbb-7 = -7
because -7 is the power to which I would raise b to get b-7
 
This is asking "To what power do I raise b to get b-7?
The answer is -7
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11/08/16

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