Question

solve:
log(x+4)=logx + log4
show work

Answer 1

do you know the log rules for adding two logs?

Answer 2

if not, have a look here first: http://www.mathsisfun.com/algebra/exponents-logarithms.html

and then try to attempt your question. If you still have trouble then post where you are getting stuck here and I'll try and help you out.

Answer 3

yes i know the rules. i got to:

(x+4/4x)=0

...is that the right track?

Answer 4

you went one step too far...
you probably got to this step first:

log(x+4) = log(4x)

- correct?

Answer 5

yes

Answer 6

then subtracted to set it equal to zero

Answer 7

ok, so you have log(something) = log(something else)

which implies something = something else

Answer 8

yes....

Answer 9

but i need an actual answer.... it's supposed to be 12

Answer 10

you got to this:

log(x+4) = log(4x)

which implies:

x + 4 = 4x

now just solve to find x

Answer 11

thank you

Answer 12

yw :)