SOLUTION: find a so that the graph of f(x) =LOGA ^ XCONTAINS THE POINT (21,4) A=

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Question 78651: find a so that the graph of f(x) =LOGA ^ XCONTAINS THE POINT (21,4)
A=
Answer by stanbon(48535) About Me  (Show Source):
You can put this solution on YOUR website!
find a so that the graph of f(x) =LOGA ^ XCONTAINS THE POINT (21,4)
y=log(base a)x
This means:
x=a^y
Substituting (21,4) you get:
21=a^4
a= 21^(1/4)=2.140695143...
Cheers,
Stan H.