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To solve the problem using log


please do explain each step in detail .

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Look the calculators has a default base 10 and you can't change it but you may learn this:
log x base y = log x / log y
log (x*y) = log x + log y
log (x/y) = log x - log y
so instead input log 8 base 2 you need to input log 8 / log 2
your example answer is about 0.919... if i get right what did you write.
Glad to help :)

Posted on Jul 06, 2009

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1 Answer

How can i solve log and antilog in casio fx991ms calculator?

To use the log function, use the log key. To use the antilog function, use the antilog key by hitting shift first, and then the log key.
25995986-24whnzqd3qh15jy4vdbyiic4-4-0.jpg For example, if we are trying to solve for n in the equation A=P(1+i)^n, where we have A, P and i, and want ot solve for n, we take the logs of both sides and we get log A = n log (1+i). To get n by itself, we divide both sides by log (1+i), we get n = log A /(log (1+i).

Good luck,


Dec 06, 2015 | Casio Office Equipment & Supplies

1 Answer

How do I use log


to explain what a logarithm is, it's to involved to explain here but check for a detailed explaination of it

i use it to find root and powers of numbers. it turn up in certain natural process like radioactive decay, population growth, interest calculations..etc

for square rooting a number

square root of 16
type 16 press the log ( I'm using a scientific calculator a TI 30s to be exact) key to get 1.204119983 for a result divide by 2 to get .602059991 press shift or 2nd log key ( to get the 10^ key - this the anti- log key) to get 4 as a result

I hope this helps

May 25, 2014 | Texas Instruments TI 30XIIS Scientific...

2 Answers

How do you convert 4726 to base 10?

4726 seems to already be on base 10
it's 4*10^3 + 7*10^2 + 2*10^1 + 6*10^0

Mar 17, 2011 | Casio FX-115ES Scientific Calculator

1 Answer

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

1 Answer

How do I use this calculator to find the logarithm of a given number? When looking up logs in the old tables, we had to change the number into scientific notation before entering the mantissa. I'm not sure...

Use the LOG key on the top row for common logs, the LN key for natural logs. In either case, simply enter the number as given then press the appropriate log key, then press =.

Oct 29, 2010 | Texas Instruments TI-30XA Calculator

1 Answer

What are the steps to solving for pH?

What do you mean by solving for the pH?
Do you have the concentration? if YES, you CALCULATE the pH with the relation
pH=-log(c) where c is the value of concentration in mol/L.
ex: c= 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 [)]

Here is a screen capture to show you both calculations


Apr 25, 2010 | Texas Instruments TI-84 Plus Calculator

1 Answer

2log(base4)x + log(base4)3=log(base4)x-log(base4)2

It is easier to use the rules for logarithms to clean this equation before trying to solve it. And the calculator is no help here.
Let me represent the logs as follows log b in base a = log(a,b). The first argument is the base.

2*log(4,x) - log(4,3)= log(4,x)- log(4,2)

Here you have two similar terms 2*log(4,x) on the left and log(4,x) on the right. Gather them both on the same side, say the left. You have

2*log(4,x) -log(4,x) +log(4,3) = log(4,x)-log(4,x) -log(4,2)

which is equivalent to log(4,x) +log(4,3) = -log(4,2)

Gather the constant terms on the right, and use log(a) +log(b)=log(a*b)

log(4,x) = -log(4,2) -log(4,3) = - { log(4,2)+log(4,3)} = -log(4,2*3)

You get log(4,x)= -log(4,6).

Take the constant term to the left, while changing its sign in the process. On the right remains 0, which is also the log of 1 in any base So log(4,x)+log(4,6) =0 =log(4,1)

Use the rule log(a) +log(b) = log(a*b) valid in any base, to obtain
log(4,6x)=log(4,1) which is equivalent to 6x=1. The solution is x=1/6

There are a few other shortcuts to get the solution but I preferred to take a pedestrian, step by step, approach.

Hope it helps.

Nov 25, 2009 | Casio FX-300MS Calculator

2 Answers

How to take antilog?

press shift log and then u can use antilog and give the numeric for which u have to find antilog then press = thats all if u are satisfied with the answer pls rate the session

Jun 20, 2009 | Casio FX-300MS Calculator

1 Answer

Random based logarithms

to do logarithms with other bases, use change-of-base. let's say you want to do log base 5 of 25. for clarity i'll write this as log(5) 25. you would have to do log(10) 25 / log(10) 5 to get 2. key sequence: [LOG], 2, 5, ), / (divide), [LOG], 5, )

Apr 03, 2009 | Texas Instruments TI-83 Plus Calculator

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