Bell Ringer (in Math Journal)
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Transcript of Bell Ringer (in Math Journal)
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BELL RINGER (IN MATH JOURNAL)
1.How can you convert from exponential to logarithmic form?
2.What base is the log button on your calculator?
3.What are the laws of exponents?
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LOGARITHMIC EQUATIONS
Monday, October 20, 2014
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REMEMBER
To convert from an exponential
25 = 32 → log2 32 = 5
And to convert from a logarithm to an
exponential
log2 32 = 5 → 25 = 32
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PROPERTIES OF LOGS-- NOTES
There are 7 laws of exponents and 3 properties of logarithms
that you need to know. Remember, logarithms are the
inverse of exponentials and some rules apply…
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PROPERTIES OF LOGS-- NOTES
Like “when you multiply, you add”
1) logb m + logb n= logb mn
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PROPERTIES OF LOGS-- NOTES
And “when you divide, you subtract”
2) logb m – logb n = logb m n
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PROPERTIES OF LOGS-- NOTES
And “when you raise a power to a power, you
multiply.”3) p logb m = logb mp
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NATURAL LOG
ln means natural log.
The inverse of ln is e which
is a number like π.
The same rules apply.
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SOLVING LOG EQUATIONS
1.If possible, simplify, get log
of the same bases equal and
“drop the log.”
2.If not, simplify and convert
to exponential form, then
solve.