Proof #1 for IB HL Math - UCF Computer Science
IB HL Math Proof: Log Base Change Solution
Assigned: 8/24/07, Friday
Due: 8/2907, Wednesday
A technique shown in class to solve problems that involve logarithms was to change the base of a logarithm via the following identity:
[pic]
Utilizing the technique of introducing new variables and using exponent rules (which we have already proven) to prove the identity shown above.
Solution
Let [pic]. Thus, be definition, we have that [pic]. Now, take log base c of both sides of this equation:
[pic], now, use the power rule previously proven in class to yield:
[pic], divide...
[pic], now, just substitute back for x to prove the result:
[pic]
Note: A different proof is show in the log notes posted online.
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