Posted by Kevin on Saturday, October 20, 2012 at 7:27pm.
solve log(7x3)+2log(5)=2+log(x+3)
I've attempted to do this question and I ended up with log(73)+log(5^2)log(x+3)=2 but I don't what to do next or whether I did something wrong.

Math  Reiny, Sunday, October 21, 2012 at 12:18am
write is as
log((7x3)(25)/(x+3) = 2
25(7x  3)/(x+3) = 10^2 = 100
divide by 25
(7x3)(x+3) = 4
crossmultiply
7x3 = 4x+12
3x = 15
x = 5
check:
LS = log 32 + log 25  log 8
= log(32(25)/8)
= log 100
= 2
= RS

Math  Kevin, Sunday, October 21, 2012 at 1:31pm
Just wondering what did you do in this log((7x3)(25)/(x+3) = 2 to get 25(7x  3)/(x+3) = 10^2 = 100?
Answer This Question
Related Questions
 math  Logarithm!!! Select all of the following that are true statements: (a) ...
 Algebra 2  how do not understand how to do this Log X + Lob (X3) = 1 I know I ...
 Math Help Please  Which of the following expressions is equal to log (x sqrty...
 Advanced Functions/ Precalculus Log  1. Evaluate 4^(log base4 64) + 10^(log100...
 Mathematics  Prove that log a, log ar, log ar^2 is an a.p. Is the following ...
 math  write as a single logarithm: 2logbase3(1/x)+(1/3)logbase3(square root of...
 Precalculus  What am I doing wrong? I keep getting 48 and its wrong... Solve ...
 mathematics logs  which three statements are true? a) if x= 10^4 then log 10...
 math(Please help)  1) use the properties of logarithms to simplify the ...
 Trigonometry  This is a logs question If u=x/y^2, which expression is ...
More Related Questions