Questions on Algebra: Logarithm answered by real tutors!

Tutors Answer Your Questions about logarithm (FREE)

Question 551203: f(x)=2x+8, Find f>-1(3)
Click here to see answer by jim_thompson5910(28476)

Question 552114: Solve the equations:
4log4x - 3log5y =1
log2x - log5y =2
Click here to see answer by AnlytcPhil(1276)

Question 552165: solve the equation :
x^y = y^x
Click here to see answer by stanbon(57219)

Question 552165: solve the equation :
x^y = y^x
Click here to see answer by jim_thompson5910(28476)

Question 552279: My teacher did not explain any of this stuff to us, so if someone could please EXPLAIN both these types of problums to me that would be awesome.
1) log 7 = 0.8
log 12 = 1.1
log 8= 0.9
Find log 1/64
2)log[5] 11 = 1.5
log[5] 6 = 1.1
log[5] 4 =0.9
Find log[5] 264
Click here to see answer by AnlytcPhil(1276)

Question 552473: 2logx^2+log10-(1/2)log4
Click here to see answer by Theo(3458)

Question 553047: Why does log(base 9)(power n/2) of 9 simplify to 2 to the n?
The power n/2 is not on the 9 it is on the log.
thanks Lynn
Click here to see answer by Alan3354(30959)

Question 553200: Using ln 2= 0.693, ln 3= 1.099, and ln 7= 1.946 to evalute the logarithm for ln 28
Click here to see answer by Alan3354(30959)

Question 553349: solve algebraically 3e^x-6e^-x=4
Click here to see answer by rapaljer(4667)

Question 553448: 2log(2y)^2+log(2b)^2
Click here to see answer by stanbon(57219)

Question 553515: write 1 - 3log(base 5) x as a single logarithm
Click here to see answer by rapaljer(4667)

Question 553523: How would I go about solving 4 = e^2ln4x ?
I've tried taking natural logarithms on each side to give ln4 = lne.ln8x but I'm not too sure that that's right!
Any help would be much appreciated, thank you.
Click here to see answer by rapaljer(4667)

Question 553714: lg x + ln 2x = 3
solve for x.
thank you
Click here to see answer by stanbon(57219)

Question 553685: 5^(3y-4)=685
y=?
Click here to see answer by rapaljer(4667)

Question 553685: 5^(3y-4)=685
y=?
Click here to see answer by bucky(2189)

Question 554012: Solve for x:
Log2(11-6x) = 2Log2(x-1)+3
Click here to see answer by rapaljer(4667)

Question 554012: Solve for x:
Log2(11-6x) = 2Log2(x-1)+3
Click here to see answer by Theo(3458)

Question 554021: Please help me a solve this logarithmic: what is expanding a Logarithmic Expression for 2y^2x?
Click here to see answer by stanbon(57219)

Question 554033: If log x^5y^3=25 and log x/y=3 what is log x?
Click here to see answer by Theo(3458)

Question 554033: If log x^5y^3=25 and log x/y=3 what is log x?
Click here to see answer by rapaljer(4667)

Question 554086: If log a=.5, log b=.3, and log c= 16, solve the following equation for x.
a^x b^x=c
Can somebody please try to guide me in the right direction? I do not want an answer to the problem, but only some guidance where to start.
Thanks!
Click here to see answer by josmiceli(9649)

Question 554218: log 4 - log 400=
can you show me how its done
Click here to see answer by rapaljer(4667)

Question 554474: log base 3(405) - log base 3 (5)
Click here to see answer by stanbon(57219)

Question 554476: ln (x+1) = lnx + ln1
Click here to see answer by Alan3354(30959)

Question 555145: log base x (8/27)=3
Click here to see answer by stanbon(57219)

Question 555048: what is the answer of the logarithm of 25 to the base 5 divided by the logarithm of 4 to the base 2?
Click here to see answer by ankor@dixie-net.com(15624)

Question 555609: Write 150 as a sum of two logarithms.
Click here to see answer by Alan3354(30959)

Question 555740: here is a question I have had some difficulty with as far as order of operations go on the calculator...
log 6(x-5)+log 6x=2
Any help would be greatly appreciated
Click here to see answer by Alan3354(30959)

Question 555917: Determine the slope of the tangent to the curve next to the point where x = 4
f(x) = 4x^3 - 5x + 2sqrt(x)
Thank you
Click here to see answer by solver91311(16868)

Question 556049: Question: Condense log 6-2 log 3+log 2.
Click here to see answer by lwsshak3(6460)

Question 556018: log7(x^2+36)=log7 100
Click here to see answer by lwsshak3(6460)

Question 555543: 5^(3y-1)=2^y
Solve for y
Click here to see answer by lwsshak3(6460)

Question 556295: write 1+log(base 2) X^3 as a single logarithm.

*i dont understand how to do the qustion without changing it into an equation, which would be incorrect. Ex. 1+log(base 2) X^3
log(base 2)X^3 = 1 (wrong!)
how would i do it ??
Click here to see answer by scott8148(6628)

Question 556489: How do I solve this? I think it's with solving by logs but I can't get the right answer.
6(2^(3x-1))-7=9
Click here to see answer by josmiceli(9649)

Question 556509: log6 (x+7)= log 6 (12)
what is x
Click here to see answer by prateekagrawal(56)

Question 556913: Find the value of in the follwing:
LOG x=-4
10

plzzzzzzzzzzzzzzzzzzzz answer this question
Click here to see answer by stanbon(57219)

Question 556922: What is the solution to the equation log 2 x – log 2 4 = 2

Click here to see answer by TutorDelphia(193)

Question 557509: log353
Click here to see answer by stanbon(57219)

Question 557670: +=1
Click here to see answer by josmiceli(9649)

Question 557768: (81)^(4x)=9
I really really need the solution to this really soon. Thank youu :)
Click here to see answer by mananth(12270)

Question 557753: How do I solve the following for x?
log(base2)9 / log(base2)3 = log(base2)2x
I tried : [log(base10) 9/log(base10)2]/[log(base10)3/log(base10)2]
= log(base10)2x / log(base10)2
Click here to see answer by lwsshak3(6460)

Question 557780: Hey,
I'd be very, very grateful if you could solve the following for me:
5/10^(2x)=7
Thank you so much. :)
Click here to see answer by lwsshak3(6460)

Question 557691: ln(x+2)-ln(x-1)=1
Click here to see answer by lwsshak3(6460)

Question 557496: 25^x + 2 * 5^x = 15
Click here to see answer by lwsshak3(6460)

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