Algebra Ch.47: Logarithmic Functions (3 of 26) Why do We Need Logarithmic Functions?

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We will learn why in the world do we even need logarithmic functions:
1) We need it to solve for sound in decibels (dB).
2) We need it to represent the amount of radioactive material that has decayed.

Next video in this series can be seen at:

[petermm]

You said divide both sides by -1/lambda, but I can't get that to work. It works if I multiple both sides by -1/lambda, or if I divide both sides by minus lambda. Was it a slip of the tongue, or have I missed something?

[jimmatrix]

What happened to the (t) in the LHS N(t)/No. In the third line it is missing.