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how do you change a^2=1.6 into a logarithm?

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2 Answers

They work the same way as each other ...

You can express exponential equations using logarithms and vice versa:

logb(expression) = number ... means the same thing as bnumber = (expression).

What I tell my students is to remember to keep the bases the same, and the exponent of the base stands alone in the logarithmic expression.

Example:  log5(25) = 2  means the same thing as 52 = 25

With natural logarithms (where the base is an understood e), you do the same thing...

Example:  ln (4) = 1.3863  means the same thing as  e1.3863 = 4

Hope this helps you.