[General - Logarithms/calculators] Calculator result not agreeing with textbook solution

I've come across something odd whilst doing an exercise for some uni work.

The questions itself is somewhat irrelevant, the problem is this:

The answer to the question is log(3/4)=-0.288...

However, when I enter log(3/4) into my calculator I'm getting -0.125...

Can anyone explain why I may be getting this result rather than the solution to the textbook? (I double checked it with Wolfram Alpha too to make sure they hadn't made an error in the textbook, but Wolfram Alpha agrees with the textbook solution solution)

I'm using a pretty standard mathematical calculator - Casio fx-85GT PLUS. If anyone can offer any reason why it's giving a different result (including "You're being a nonce Yayzeus") I'd be very grateful!

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π€︎ u/Yayzeus
π︎ Jan 13 2020
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Trying to calculate logarithms, calculator appears to give me incorrect output?

It looks like this

The correct answer is 3.6532... Any insight on what Iβm entering wrong?

Thank you!

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π€︎ u/ofvirginia
π︎ Feb 05 2021
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I have no clue what to do. I have applied all the rules I know. I don't know why the textbook always makes us use a calculator to compute logarithms but for the homework we have to not use a calculator??? Any help in the right direction without giving it out so easy I wanna learn. Thank you

Thanks here is the problem.

Thank you to those who helped walk through me the problem!! I guess I was focusing so much on the wrong areas when the answer was literally right in front of me...

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π€︎ u/IEmajor
π︎ Sep 21 2020
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How were roots and logarithms inititially calculated without the use of calculators?

Right now all I do is use the root, log or ln button in my calculator and it spits the answer out. Is there a systematical way of calculating this by hand?

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π€︎ u/Magisidae
π︎ Dec 13 2017
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[Calculus 1] Asking to put this into a single logarithm. Even online calculators canβt figure out how
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How do i find x in 8^x=32 without using a calculator and Logarithm?
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π€︎ u/Anonybeech
π︎ Jun 08 2020
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As someone who has never programmed before, I am unreasonably happy about this crappy logarithm calculator pastebin.com/vgBPnyVB
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π︎ Sep 22 2018
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"[Logarithms] are not as popular today as they were before the advent of calculators..." What?

Why would logarithms be unpopular after calculators have been invented?

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π€︎ u/Taste_Of_Cherry
π︎ Feb 13 2019
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My mum found her old slide rule for trigonometry and logarithms before calculators were used.
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π€︎ u/The-Box_King
π︎ Apr 01 2017
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Logarithms celebrate their 400th birthday: four centuries ago, John Napier provided human calculators a faster way to multiply sciencenews.org/blog/contβ¦
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π€︎ u/nastratin
π︎ Jul 26 2014
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By combining existing genetic βparts,β or engineered genes, in novel ways, MIT engineers have transformed bacterial cells into living calculators that can compute logarithms, divide, and take square roots, using three or fewer genetic parts. kurzweilai.net/cells-as-lβ¦
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π︎ Jul 19 2013
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Dear Math Wizards: Can base 10 Logarithms be evaluated without a calculator?

EDIT : Thank you for all the replies guys, these comments and solutions are fantastic!

Forgive me if this is a stupid question.

My little sister claims her chemistry teacher wants them to solve base 10 logarithms without a calculator on a test on Monday. (and she's a little panicked)

Stuff like:
pH = pKa + log ([Base]/[Acid]) pH = 7.6 + log ([0.6]/[0.9]) pH = 7.6 + log (.66) pH = 7.6 + (-0.18) pH = 7.42

It's been 10 years since I minor'd in math so I'm ungodly rusty. I've been googling and reading up on logarithms, but I haven't yet found a way to do log(0.66) without a calculator.

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π€︎ u/epicgeek
π︎ Sep 23 2011
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[Apps] Matrix Determinant Pro -- Business Calculator Pro -- Decimal to Fraction Pro -- Logarithm Calculator Pro -- GO Locker Sonic (Free)
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π€︎ u/ProperGearbox
π︎ Sep 28 2017
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Difficulties with logarithms when not using calculator. http://i.imgur.com/z1bobbo.png

I need help to solve this question without calculator. Thank you!

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π€︎ u/niklas1995
π︎ May 08 2016
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/u/taedrin responds to: How were roots and logarithms inititially calculated without the use of calculators? [+90] np.reddit.com/r/asksciencβ¦
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π︎ Dec 13 2017
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Is there a way to calculate square roots and logarithms by hand without a calculator? [Highschool math]

I am asking this because it might be useful.

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π€︎ u/chchan
π︎ Sep 26 2014
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How did we find complex logarithms and trig. functions before calculators AND the tables? If they can be programmed into calculators, isn't there a formula?

I'm looking to get a little more math history, I guess.

How could one find say x in 2^x =33 without the use of a calculator, or a logarithm table, or even a slide rule?

Problems like those, how were they originally solved? Guess and check? but then how were the programs made?

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π€︎ u/ProfessionalGeek
π︎ May 03 2011
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[Explanation] Calculators | 4-4 | Inverse Logarithms

Most of us do not have a calculator that has an [INV] key to inverse a logarithm, so if you need to do an inverse log, you must follow the following to do so (usually when going from a pH to [H^(+)] concentration):

STEP I - Press the [10^(X)] Key

> 10^ (

STEP II - Enter (^(-)1) [to change sign]

> 10^ ((^(-)1)

STEP III - Enter the [pH] and [)]

> 10^ ((^(-)1)[pH])

And then press [ENTER] to solve. Remember that your answer should have as many significant figures as there were decimals with the pH you started with. For example:

Given...

> pH = X.XX

> [H^(+)] = Y.XXX*10^(-5) M

Notice how there are 3 X's (Sig Figs) in the given, and there are 3 X's in the decimal places of the answer.

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π€︎ u/The_fartocle
π︎ Apr 05 2016
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Spotlight calculator: Can I specify the base of logarithm?
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π€︎ u/jscoder
π︎ Nov 04 2014
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[High School Math] Using a graphing calculator to graph transformed Logarithms

Is this possible? For instance, if we had y = log3X (3 being the base, I'm not sure how to make it small,) I'd be able to graph it by putting logx/log3 in Y1 in the calculator. However, if we had y=log3(x+9) + 2 , I can't figure out how to graph that. Thanks!

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π€︎ u/climbon1968
π︎ Jun 18 2013
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Cells as living calculators: using analog computation circuits, MIT engineers design cells that can compute logarithms, divide and take square roots mit.edu/newsoffice/2013/cβ¦
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π€︎ u/nastratin
π︎ May 16 2013
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Square roots and Logarithms Without a Calculator (index to 11-part series) meangreenmath.com/2014/12β¦
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π︎ Mar 04 2015
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