Questions on Algebra: Logarithm answered by real tutors!

Tutors Answer Your Questions about logarithm (FREE)

Question 405675: set this to a single logarithm: log 10 + log 10
Click here to see answer by nerdybill(6958)

Question 405740: Solve log (8x + 15)=1

Click here to see answer by MathLover1(6625)

Question 405990: My teacher didn't teach us how to deal with numbers in front of log.

5 is the base
Click here to see answer by Tatiana_Stebko(1326)

Question 405954: how do you use natural logarithm to solve e^x=18?
Click here to see answer by richard1234(5390)

Question 406072: 3*5^2t-1=75
Click here to see answer by Alan3354(30993)

Question 406074: log(2+x)-log(x-3)-log(2)=0
Click here to see answer by nerdybill(6958)

Question 406092: 2log^3 2 log^3 7
Click here to see answer by Alan3354(30993)

Question 406161: log1000
Click here to see answer by Alan3354(30993)

Question 406165: ln of 5 - lnx equals 3
Click here to see answer by MathLover1(6625)

Question 406387: Simplify the expression: 4logu-5logu^6
Click here to see answer by stanbon(57290)

Question 405955: Use the facts that log 3 = 0.4771 and log 4 = 0.6021 to find the value of the logarithm.
log 12

Click here to see answer by lwsshak3(6490)

Question 403430: Write the expression as a single natural logarithm
3ln a-1/2(lnb+lnc^2)
Click here to see answer by lwsshak3(6490)

Question 406164: log 3 square root 27
Click here to see answer by jsmallt9(3296)

Question 406163: log base 9 of 6x cubed minus log base 9 of 2x equals 1
Click here to see answer by jsmallt9(3296)

Question 406814: how do you convert BBB(base16) to decimal.
Click here to see answer by scott8148(6628)

Question 406811: apply binary compliments to subtract 101111base2 from 110111base2.how do you even start on these??
Click here to see answer by Alan3354(30993)

Question 407091: How do I convert the formula L=10* Log(I/Io) into exponent form?
I already know how to do the decibels (obv with the formula above) but I can't find the I/Io unless I know how to convert that formula into exponent form. Please help :)
Click here to see answer by jsmallt9(3296)

Question 407010: how do i solve (3y-1)^6=80 using logarithms?
Click here to see answer by lwsshak3(6490)

Question 406798: the relationship between two currents in a circuit is given by I1+I2=14 and 3I+I2=30.Calculate I1 and I2.
how do you go about this one,please assist.
Click here to see answer by ewatrrr(10682)

Question 407005: How do I solve 2x^5=100 using a logarithm with an answer to three significant digits?
Click here to see answer by lwsshak3(6490)

Question 407203: Differentiate y=sin(theta) from first principle
Click here to see answer by richard1234(5390)

Question 407203: Differentiate y=sin(theta) from first principle
Click here to see answer by robertb(4012)

Question 407676: What is the domain of Log3(x+2)?, with explanation
Click here to see answer by scott8148(6628)

Question 407594: Solve for x, given the equation, 5+3ln(x) = 7ln(x^2). Answer with three significant digits.
Click here to see answer by lwsshak3(6490)

Question 407484: Lnx = 4 solve for X
Click here to see answer by lwsshak3(6490)

Question 407756: (e^2x)-(2e^x)-15=0
Click here to see answer by lwsshak3(6490)

Question 407766: if

x^2 + y^2 = 6xy
prove that:
2log(x+y) = log x + log y +3log 2

plz i want the answer quickly
Click here to see answer by robertb(4012)

Question 407909: can anybody help me solve this question it says;graphically solve the following simultaneous equations
y=1+0.4x
y=4-0.6x
Click here to see answer by Alan3354(30993)

Question 407913: solve the equation (2^x).(2^x+1)=10 correct to 3decimal places
im getting my answer as 1.161 but it dont tally when i substitute the value for x pliz help
Click here to see answer by graphmatics(170)

Question 407910: simplify by rationalising the denominator
[(sqrt10)+(2sqrt5)]/[(sqrt10)+(sqrt5)]
Click here to see answer by Edwin McCravy(8904)

Question 407910: simplify by rationalising the denominator
[(sqrt10)+(2sqrt5)]/[(sqrt10)+(sqrt5)]
Click here to see answer by graphmatics(170)

Question 408682: Solve the following exponential equations using logarithms:
2^(x) = 3^(x+1)
Feeling pretty lost on this one...
I've tried to google for similar examples, but when I do find a similar problem it's solves using a form like this: "xln(2)=(xln(3)+ln(3))" I think this is a little beyond where I am now :( Looking for a more basic algebra solution!
Appreciate any help!!
Thanks :)
Click here to see answer by richard1234(5390)

Question 408674: Solve the following expression using a common base:
(1/2)^(4x+1)=(1/4)^(3x+3)
I figured that I could turn 1/2 into (1/4)^2, (you end up with x=1/5), but LS does not equal RS with x=1/5
I'd appreciate some help!?
Thanks :)
Click here to see answer by scott8148(6628)

Question 408709: Hi,
I would like to know how to convert a log value back to its normal value. I looked up on the internet and found tat in can be done by (10^x), where x is the logarithmic value and the answer i get would be the actual value before applying the log.
Thanks in advance.
Harish.
Click here to see answer by richard1234(5390)

Question 408784: How do I change this to a quotient or product?

Click here to see answer by jsmallt9(3296)

Question 408507: solve for x. log(2)^x=8+9log(x)^2
Click here to see answer by jsmallt9(3296)

Question 408800: log(base 5)x + log(base 5)(4x-1)=1
Click here to see answer by jsmallt9(3296)

Question 408798:
log square root(x+3)=1
Click here to see answer by jsmallt9(3296)

Question 408367: what is the solution for 4 to the 2nd power x = 28
Click here to see answer by jsmallt9(3296)

Question 408847: Solve the following expression using a common base:
(1/2)^(4x+1)=(1/4)^(3x+3)
I figured that I could turn 1/2 into (1/4)^2, (you end up with x=1/5), but LS does not equal RS with x=1/5
here's what I tried:
(1/2)^(4x+1)=(1/4)^(3x+3)
(1/4)^2(4x+1)=(1/4)^(3x+3)
(1/4)^(8x+2)=(1/4)^(3x+3)
8x+2=3x+3
8x-3x=3-2
5x=1
x=(1/5)
LS:
=(1/2)^(4x+1)
=(1/2)^(4(1/5)+1)
=(1/2)^1.8
=0.287
RS:
=(1/4)^(3x+3)
=(1/4)^(3(1/5)+3)
=(1/4)^(3.6)
=0.0068
LS does not equal RS, so I'm oviously wrong...
I'd truly appreciate any help I could get!! Thank You :)
Click here to see answer by ewatrrr(10682)

Question 408893: 12logx=6
Click here to see answer by nerdybill(6958)

Question 408961: This one is really stumping me... Havent got into the ln function yet, only using log base 10 at this point
Solve the following exponential equation using logarithms:
(3^2x)-(3^x)=216
Click here to see answer by Alan3354(30993)

Question 409004: solve for x: log4 x- log4 (x+15)=-1
Click here to see answer by nerdybill(6958)

Question 409003: solve for x: log x-log(x+11)=-1
Click here to see answer by scott8148(6628)

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