Question

log[5]72

Answer 1

ok now we have a problem you want
\[5^x=72\] but you do not know it because 72 is not an obvious power of 5

Answer 2

do you remember how i showed you to cheat on
\[\log_3(\frac{1}{9})\]?

Answer 3

you do the same thing here but now it is not cheating. it is the only way to do it

Answer 4

type in
\[\log(72)\div \log(5)\] to get your answer

Answer 5

i got 2.657

Answer 6

i get 2.657 rounded and so should you

Answer 7

yes that is it

Answer 8

remember
\[\log_b(A)=\log(A)\div \log(b)\]

Answer 9

you have two logs on your calculator,
\[\log\] and \[\ln\]

Answer 10

you can use either one. so for example you could have typed in
\[\ln(72)\div \ln(5)\] and you would still get 2.657 try it

Answer 11

cool!

Answer 12

yes as long as you don't mix them it will work. one more. i
it is the same when you want
\[3^x=50\] you type in
\[\log(50)\div\log(3)\] to get x