Question

28x = 7 solve.

Answer 1

Divide both sides by 28

Answer 2

oh I'm sorry, the x is an exponent @kc_kennylau

Answer 3

take log on both the sides and then proceed

Answer 4

so log 28 and log 7? i have to find those to proceed

Answer 5

nope
here are the steps:
1) divide both the sides by 28
2) take log on both sides :
you will get
x= log(7/28)
because log(exp(x))=x

Answer 6

ohhhhh okay that makes sense lemme try

Answer 7

log28^x=log7
=> xlog28=log7
=>x=log7/log28

Answer 8

\[\Large\begin{array}{rcl}
28^x&=&7\\
\log28^x&=&\log7\\
x\log28&=&\log7\\
x&=&\frac{\log7}{\log28}
\end{array}\]

Answer 9

PostScript: The base of the logarithm does not matter.

Answer 10

okay i got it wrong way...
i thought it as 28 * exp(x) = 7
sorry

Answer 11

@kc_kennylau is absolutely right.

Answer 12

how do i read that? lol i can kinda understand it

Answer 13

?

Answer 14

your post before you said post script? why are there the brackets and stuff

Answer 15

oh

Answer 16

your computer cannot render LaTeX

Answer 17

well thats strange lol

Answer 18

That is strange because no setup is needed to render LaTex... try refreshing the page?

Answer 19

wouldnt it be \[\log_{28} 7 = x \] ?

Answer 20

@wendylisette \(\large\log_{28}7\) and \(\dfrac{\log7}{\log28}\) are just the same :)

Answer 21

still isnt working but i think i figured it out by the format you all gave

Answer 22

ahh okay (: but if you have a ti-84 calculator just plug it in

Answer 23

lol i dont, but i found one online. a logarithm calculator

Answer 24

oh ok (:

Answer 25

@aly_peters I'll try to translate it to plain text:
28^x = 7
log(28^x) = log 7
x log 28 = log 7
x = log 7 / log 28

Answer 26

http://www.wolframalpha.com is a good calculator :)

Answer 27

its 0.5839708 it's much longer than that but i cut it off