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Tutors Answer Your Questions about logarithm (FREE)
Question 113440: I need help with 2 problems using my new TI-84 Plus:
1.find x: log x=3.8893
The answer I got was:.5898714436 Is this correct?
2.find x: log x = -1.5003
I enter LOG(-1.5003) enter and I get an error:syntax message Help!!
Click here to see answer by edjones(3821)   |
Question 113440: I need help with 2 problems using my new TI-84 Plus:
1.find x: log x=3.8893
The answer I got was:.5898714436 Is this correct?
2.find x: log x = -1.5003
I enter LOG(-1.5003) enter and I get an error:syntax message Help!!
Click here to see answer by josmiceli(3136)  |
Question 113537: I'm a tutor, but I have a question which I can't answer myself, other tutors please help.
How do you solve  ?
For example
 which is  We all know that 4 satisfies the equation, but how do you actually solve this kind of problems? Is there only one possible solution?
Click here to see answer by stanbon(28428) |
Question 114077: Will donate. Please help solve two problems.
1.Use the properties of logarithms to write the following expression as a single logarithm:
2.Use the properties of logarithms to expand the expression as much as possible:
Click here to see answer by stanbon(28428) |
Question 114159: Need Help, Please!
Use the product,quotient, and power rules of logarithms to rewrite the expression as a single logarithm. Assume that all variables represent positive real numbers.
1/2 log(2,x^4) + 1/4 log(2,x^4) - 1/6 log(2,x)
Thank you!
Click here to see answer by stanbon(28428) |
Question 114092: about this question..
log (7, 1/49)
log with a base of 7
Evaluate the logarithm..
log(7, 1/49)
or if this is better
log7 1/49
(7 is the base)
would it
be 2 or -2??
because log (7, (1/7)^2
or log7 (1/7)^2
the 7's would cancel leaving 2
Click here to see answer by stanbon(28428) |
Question 115033: I need help solving this word problem:
The debt on a certain credit card follows the function d=9000*1.015^t where d = debt in $ and t= time in months.
A)How much debt will be owed in t=6 months?
B)How long will it take for debt to exceed $15,000?
I think i have A) here is what i did on it:
d=9000*1.015^6
d=$9,840.99
And i couldnt finish b part but here is where i got:
$15,000=9,000*1.015^t
6,000=1.015^t
I just dont understand how to get the t down from an exponent and finsih it for t!
Any help is greatly appreciated THANKS!
Click here to see answer by scott8148(3570)  |
Question 115120: 2^x - 6(2^-x) = 6
This problem is from Schaum's Outlines - Precalculus, chapter 19 page 180.
That book doesn't provide many examples (let alone good ones) so, while I can solve a similar one (or that same one if I plug = 1 instead of = 6), I don't know how to solve this one.
It should be ??? = 3 and then we work it out, but unless I'm muliplying 2^x by 1, I don't know what u will equal. So I can't find the value for x.
(2^x)^2 - 6 = 6.2x
u^2 = (2^x)^2 u = ???
Click here to see answer by jim_thompson5910(14556) |
Question 115137: Solve the following algebraically: e^x-6e^-x=1; this is what I have thus far.
e^x(e^x-6e^-x)=e^x(1)
e^2x-6=e^x
e^2x-e^x-6=0
then use a quadratic equation to solve:
-(-1) +-square root (-1)^2-4(1)(-6)/2(1)
1+-square root 1+24/2
1+-square root 25/2
1+-5/2 = 1.0986
Is this correct?
Click here to see answer by jim_thompson5910(14556) |
Question 115137: Solve the following algebraically: e^x-6e^-x=1; this is what I have thus far.
e^x(e^x-6e^-x)=e^x(1)
e^2x-6=e^x
e^2x-e^x-6=0
then use a quadratic equation to solve:
-(-1) +-square root (-1)^2-4(1)(-6)/2(1)
1+-square root 1+24/2
1+-square root 25/2
1+-5/2 = 1.0986
Is this correct?
Click here to see answer by bucky(1732) |
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