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A problem with logarithms 2019-08-23
Iriogbe pose la question :
Find the value : if log3 (a-6) =2b and log2 (a-7) =3b
Penny Nom lui répond.
4^x=2^x+6 2019-04-05
Olivia pose la question :
How do you find the (b,n) if the solution of the equation 4^x=2^x+6 can be expressed at logb(n) where b and n are both prime numbers?
Penny Nom lui répond.
4444^4444 2017-12-10
Sashi pose la question :
4444 to power of 4444=?
Please share the result with simplification.

Penny Nom lui répond.
Find two values of x satisfying f(x)=1 where f(x)=sin(ln(x)) 2016-01-21
Ruth pose la question :
I'm trying to find two values of x satisfying f(x)=1 where f(x)=sin(ln(x))
Penny Nom lui répond.
Manipulating an expression using logarithms 2015-05-18
Katie pose la question :
Solve x=At^be^-ct for b in terms of c.
The e is Euler's number, not a letter or random placeholder.
v I've tried 2 methods on my calculator, and I am unsure as to why they give me different answers, and which one is correct.
For some reason, when placing a multiplication sign in between the A and the first t, I get a completely different answer. Why is this?
Also, which is the right answer for the question I have?
Thank you!
Katie :)

Penny Nom lui répond.
How do we use logarithms in our daily life 2014-06-01
ss pose la question :
how do we use logarithms in our dailylife
Penny Nom lui répond.
The inverse of y = 5^x 2014-03-07
Melody pose la question :
how do you find the inverse of y = 5^x
Penny Nom lui répond.
Evaluate log3 14 2013-11-17
Tash pose la question :
Use the Change of Base Formula and a calculator to evaluate the logarithm, correct to six decimal places. Use either natural or common logarithms.

log3 14

Penny Nom lui répond.
4=(1+.08)^x 2013-06-15
Samantha pose la question :
I can't seem to understand how to solve for x when it is in power form, here is the equation:

4=(1+.08)^x

Penny Nom lui répond.
The exponential form of log8=P 2012-04-25
Kristina pose la question :
what is the exponential form of log8=P
Penny Nom lui répond.
A log equation in exponential form 2011-11-11
Sarah pose la question :
Express the equation in Exponential form

log2 to the 16th power=4

Penny Nom lui répond.
Uses of logarithms 2011-11-09
BEA pose la question :
what is the use of logarithmic functions in real life or daily life?
Penny Nom lui répond.
An equation involving logarithms 2010-09-27
mindy pose la question :
Hi,
I am trying to find x, the equation is:
log_2(log x + 2 (log x)^(1/2) + 1) - 2 log_4((log x)^(1/2) + 1) = 1

Thank you very much for your time. =)

Harley Weston lui répond.
Log[f(x)] 2010-03-08
sourabh pose la question :
What is the number of solutions of the equation 9 x 2 - 18 x + 5 = 0 for x, such that the expression log10[(x+1)(x+2)] exists?
Harley Weston lui répond.
541.39(1 + i)^15 = 784.09 2009-10-14
Fitore pose la question :
Hi, I noticed that this question was already posted up, however I was hoping I could solve it without having to use logs. Can you please help me? The equation is: 541.39(1 + i)^15 = 784.09
Penny Nom lui répond.
Exponential form 2009-08-05
motaz pose la question :
Let x = log_2 1/8 Write the exponential form of the equation and solve the equation for x
Stephen La Rocque lui répond.
Log_7 (4X) = Log_14 X 2009-07-08
Mukulu pose la question :
Help me with this question because i tried my level best to get the right answer but i failed Log_7 (4X) = Log_14X
Stephen La Rocque lui répond.
(logx)squared + log (xcubed ) +2 =0 2009-05-19
michael pose la question :
Solve for x: (logx)squared + log (xcubed ) +2 =0
Penny Nom lui répond.
An inequality with logs 2009-03-06
Indrajit pose la question :
(x/10)^(logx - 2)<100..........how to solve this one??
Stephen La Rocque lui répond.
6^x = y 2009-02-12
Jamie pose la question :
Find x: 6^x=y
Harley Weston lui répond.
A log base 2 problem 2008-11-26
dave pose la question :
solve for x

(log base 2 of x) - (log base 2 of (x-2)) = 3

Penny Nom lui répond.
How do you solve "logx^4=4? 2008-11-17
Scott pose la question :
How do you solve "logx^4=4"?
Penny Nom lui répond.
4^x = 2^x + 12 solve for x 2008-10-02
Dave pose la question :
4^x = 2^x + 12 solve for x.
Harley Weston lui répond.
What is the derivative of (2^sinx)/(logbase4(2x+1))? 2008-09-16
Jesse pose la question :
What is the derivative of (2^sinx)/(logbase4(2x+1))
Harley Weston lui répond.
2^x = 1,000,000 2008-09-06
Peter pose la question :
How do I solve for "x" in the following equation: "2 to the power of x = 1,000,000" ?
Penny Nom lui répond.
Solve e^x + e^(x+1) = 250 2008-08-25
Laura pose la question :
"solve this equation correct to three decimals"
e^x + e^x+1= 250

Penny Nom lui répond.
Write log_2 (1/8) = -3 in exponential form 2008-06-27
Jaime pose la question :
how do you write log2 (1/8) = -3 in exponential form?

the 1/8 is a fraction and the 2 is a base of 2

Penny Nom lui répond.
limit x->0 (logx-log(x-1)) 2008-05-22
kritica pose la question :
lt x->0 (logx-log(x-1))
Harley Weston lui répond.
Which is larger, 727464^512693 or 624610^518548? 2008-05-18
Yahweh pose la question :
Lets say I have two very large numbers in the form of a^b: 727464^512693 and 624610^518548

I want to calculate which number is larger, but its unreasonable to type these numbers into a spreadsheet to get an answer right away. How could I determine the larger or the two numbers efficiently?

Stephen La Rocque lui répond.
The inverse of a function 2008-05-03
keith pose la question :
please help me find the inverse of this function:

h(t) = 2 + 4 ln(1-5t)

Stephen La Rocque lui répond.
log2x+log(x+4)=1 2008-04-12
ryan pose la question :
solve the equation for x, log2x+log(x+4)=1
Penny Nom lui répond.
log(0.81) 2007-06-28
Ade pose la question :
If log 3 = 0.477 . The answer of log 0.81
Harley Weston lui répond.
A problem involving logs 2006-11-26
Beth pose la question :
any help would be appreciated on how to solve without using the change of base formula for logarithms in the solution and check of the solution!!!

log256 (x) + log16 (x) + log4 (x) + log 2 (x) = 7/4

Stephen La Rocque and Penny Nom lui répond.
How many digits are in the number 2^64? 2006-06-14
Trang pose la question :
How many digits are in the number 264?
Stephen La Rocque lui répond.
Differentiation, powers and logs 2006-01-06
Claudia pose la question :

Question: how do I find the derivative of

x* ln(x+(e^2))^2

x^lnx

x^(e^(-x^2))


Penny Nom lui répond.
Some logarithm problems 2005-01-27
Jo pose la question :
Given ln x=7.1; ln y=8.2, Find ln(x^3y^7)
Penny Nom lui répond.
Logs 2004-02-29
Sandy pose la question :
find X
3/2logb4-1/2logb8+logb2=logbx

my book uses prop 7 to rewrite as logb4raised3/2-logb8raised2/3+logb2=logbx; then writes logb8-logb4+logb2=logbx how did it get here?

Claude Tardif lui répond.
A problem with logs 2004-02-22
Caitlyn pose la question :
problem: ln x + ln (x-2) = 1

I can solve this on the calculator, but the book wants 1+ [(sqroot)1+e]. How can I get the e?

Penny Nom lui répond.
Logarithms 2004-02-01
A student pose la question :
Where did the word logarithmic come from? Where/whom did it originate?
Harley Weston lui répond.
Domain of a function 2003-10-14
Karim pose la question :
Find the Domain of the Function
H(x) = Log3 (4x + 7)-10
H(x) = log base 3 times 4X plus 7 minus 10
i am having problem solving these kinds of problems.

Penny Nom lui répond.
Solve x = y^z for z 2003-06-28
Nathan pose la question :
If x = y^z is there a way to solve for z, if x and y are given, without guessing or already knowing the answer?

ie: 64 = 2^z
6 is the obvious value for z. Is there a way I could solve for this variable using a formula, which would also apply when more complex values were substituted for x and y?

Penny Nom lui répond.
1996^1999 and 1999^1996 2001-07-29
Rajesh pose la question :
what is greater 19991997 or 19971999?
Chris Fisher lui répond.
Where will we use this in the real world? 2000-10-11
Jane Ann Musgrove pose la question :
As a teacher of mathematics, I am always asked "Where will we use this in the real world?". I am seeking ideas/sites via the internet where students can find answers to this type of question. Can you help me?

To be more specific, right now I am interested in finding careers where the employees would use the concepts of "Radicals", "Matrices", and "Logarithms". This information will be used by students to make presentations to the class on their findings from internet searches.


Harley Weston lui répond.
Two calculus problems 2000-05-01
Kaushal Shah pose la question :
How Do WE Integrate the following Functions,
  1. Integral xtanx dx
  2. How was natural base "e" discovered and why e=2.7.......

Claude Tardif lui répond.
Logs 2000-04-12
Jessica pose la question :
Write as a single log 3ln x - 2ln(y+e) + 5ln(x-12) - 4ln y
Harley Weston lui répond.
Characteristic of a logarithm 2000-03-14
Andrew Strauss pose la question :
What is the characteristic of log base 18 of 1980 ?
Harley Weston lui répond.
Logarithms 2000-01-18
Jennifer pose la question :

Hi I have a test tomorrow and I was wondering if you could help me with these two problems.

  1. Explain how to express y in terms of x if log3y=4log3(2X)

  2. The LN key on your scientific calculator is not working, but the ex and LOG keys are. Write directions for calculating a natural logarithm using the ex and LOG keys. Explain why these directions will get you the right answer.


Harley Weston lui répond.
Three algebra problems 1999-12-28
Stephanie Branton pose la question :
  1. If P represents the product of all prime numbers less than 1000, what is the value of the unit's digit of P?

  2. Do any real numbers a and b exist such that: ln(a+b)=ln a + ln b? if so, what are they?

  3. Define a function by: f(x)=1/1-x where x is not equal to 0,1. what is f(f(f(a)))?

Harley Weston lui répond.
Logarithms 1999-12-16
Pierre pose la question :
Can you please answer those three question

  1. inverse or the exponential function.

    logx 81 = 4,
    x expo4 = 81,
    x = +or- 4square root 81,
    x = +or- 3
    s.s = {3}
    Why is -3 not acceptable.

  2. .
    .
    .

Harley Weston lui répond.
Two derivatives 1999-11-16
Gina Renicker pose la question :
The derivative of:

y=e(xlnx) and y=x2arctan(x1/2)
Harley Weston lui répond.

Derivatives with logs 1999-10-26
Kate pose la question :
What is the derivative of 5 to the 5x-2 at x equals 0.8?
Harley Weston lui répond.
-log(a) 1999-10-22
Brenda Miskimmin pose la question :
I need to know the mercury concentration in mg/L or ng/L for the following:

-log M (Hg) = 8.5

where mw of Hg=200.59

(it's the negative sign in front of log that confuses me).
Harley Weston lui répond.

Solving using logs 1999-10-11
Rich Bolton pose la question :
Here's my question:

$541.39(1+i)15=784.09

Can you please show me how to do this?
Penny Nom lui répond.

A Series 1999-04-20
Deepak Shrestha pose la question :
Given the sequence an=e^(-n*Ln(n)), does the series converge and why?
Harley Weston lui répond.
Logs 1998-10-21
Benny pose la question :
What does log means? How come we have to use log
Chris Fisher lui répond.
Two Problems 1998-07-28
James Pulver pose la question :
How do you solve these problem? If log abc=16 and log ac=12 , find b. (The logs are log base 10.)
and
If a and b are real numbers, i^2 = -1 and (a+b)+5i=9+ai what is the value of b?

Jack LeSage lui répond.
A Problem with Logs. 1997-11-26
Herman pose la question :
Given log 24=a, log 25=b and log 26=c, express log 39 in terms of a, b and c.
Penny Nom lui répond.
Natural Logarithm Functions 1997-04-23
Rickson pose la question :
The following two questions are some of my son's homework that he is having trouble with......any advice or assistance would be appreciated.

(eX)5=1000.............the X and 5 are exponents

lnx + ln(x+3) = ln10

In each question the problem is to find x.
Harley Weston lui répond.

 
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