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Find log(1-.2) Please find log(1-.2)

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I don't get it but here some help with logs:
log x base y = log x / log y (when log x is default base 10 in calculators) and
log (x*y) = log x + log y
log (x/y) = log x - log y
the bases is default 10
hope it's helped

Posted on Jul 06, 2009

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Posted on Jan 02, 2017

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When I go to use the 'log' button on TI 30XA I do not come up with the same answer as in my course book (for the examples) No real instructions on logs in the little instruction book. Have tried...


You calculate the pH with the relation
pH=-log(c) where c is the value of concentration in mol/L.
ex: c[H+]= 3.57x10^(-6)
pH: (-) [LOG] 3.57 [2nd][EE] [(-)] 6 [ ) ]
Here you have 2 change sign key press [(-)]

If you have the pH, and want to calculate the concentration that yields that value of the pH you proceed as follows
c= 10^(-pH)
Ex pH=8.23
c: [2nd][LOG] [(-) 8.23 [)]

General shortcut.
If concentration is of the form c[H+]= 1*10^(-a) where a is an integer between 0 and 14, the pH is equal to the positive value of exponent.

Ex:c[H+]=1x10^(-5) Mol/L then the pH is just the positive value of the exponent, ie 5 because pH=-log(1.x10^-5) =- log1 -log(10^-5)=0 -(-5)=5
Above I use the rule log(axb)=log(a)+log(b) , the rule log(a^b) = b*log(a)and the facts that log(1)=0 and log(10)=1, the last being true if log stands for log in base 10.

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My calculator is giving me the wrong answers for the Log^-1. I keep on pressing SHIFT then the Log and the anti- log keeps on coming up as 10^. Before it would appear on the screen as Log^-1 ( ). Please...


Sorry the answer comes too late for your final exam. If you took the time to really understand what the inverse of a log function is, you would have saved yourself the anxiety before the test.

Anyway, the inverse of the logarithm in base 10 IS the power function with base 10.
y=log(x) <=> x=10^(y).

Some calculator manufacturers use the marking ^-1 to represent an inverse function. But recently one sees new calculators with the new notation.

By the way, the inverse of the natural log function (LN) is the exponential function (e^(x))

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I have a Texas Instruments BAII Plus Professional Calculator. In the course I'm in, I need to know how to calculate the following formula = 1 + 3.3 log (n) The problem is that I can't figure out how to...


Pressing 2 0 0 LN = will give you the natural logarithm of 200. If you need the common (base 10) logarithm, divide the result by the log of 10.

( 2 0 0 LN ) / ( 1 0 LN ) =
will give you the common log of 200.

Jan 05, 2011 | Texas Instruments BA-II Plus Calculator

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Log^-1(11/20) please solve step by step.


Assuming you want the common antilog of 11/20:
2nd 10^x 1 1 / 2 0 ENTER

10^x is on the LOG key, to the left of the 7 key.

Nov 15, 2010 | Texas Instruments TI-83 Plus Calculator

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Guys i need to get an inverse log the same as log-1 ou know how?


Hello

When you talk about the natural logarithms [LN], the inverse of the log is the exponential

ln (exp(x))=exp(ln(x)) =x
but with othe logarithms, thinhs are different
Let us take

y=10^(x)

then with log standing as usual for log in base 10 take the log of both members in the above equality

log(y) =log{10^(x)) = x* log(10) : this is a property of the log function.
However, log(10) =1 This is also a property of the log

Gathering results, we end up with the new equality
log(y)=x or x=log(y)

Without entering into extraneous details that mathematicians adore, we can state that there is an equivalenve between y=10^(x) and x=log(y)

y=10^(x) <-->x=log(y) where <--> means implication in both directions.

Here is a screen capture from another calculator to convinve you. Your calculator cannot do that.

747f13f.jpg

Hope it helps.

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