Thread: 2n=128

Hi! Great site. How would I solve for n if n is an exponent?

2n=128

Originally Posted by rune2402

Hi! Great site. How would I solve for n if n is an exponent?

2n=128

express 128 as 2 raised to some power, then equate the powers

Find the prime factorization of 128 and see how many twos there are in it.

I understand that, but how do I isolate n?

Originally Posted by rune2402

Hi! Great site. How would I solve for n if n is an exponent?

2n=128

Originally Posted by SnipedYou

Find the prime factorization of 128 and see how many twos there are in it.

Originally Posted by rune2402

I understand that, but how do I isolate n?

Have you tried to find the prime factorization of 128, as SnipedYou suggested? This should answer your question. If not, post your factorization of 128 and I'll let you know how to proceed from there.

-Dan

Can someone write the math so i can see? I'd like to be able to do this for different problems.

Originally Posted by rune2402

I understand that, but how do I isolate n?

i told you. when you are able to express 128 as a number with base 2 (you can use SnipedYou suggestion to help you in this endeavor, but it is a small enough number to do by trial and error pretty quickly) just equate the powers. this will isolate n in a new equation

Originally Posted by rune2402

Hi! Great site. How would I solve for n if n is an exponent?

2n=128

Use logarithms

2^n = 128
Log(2^n) = Log(128)
n*Log(2) = Log(128)
n = log(128) / Log(2)
n = 7 -------------------------answer.

Originally Posted by ticbol

Use logarithms

2^n = 128
Log(2^n) = Log(128)
n*Log(2) = Log(128)
n = log(128) / Log(2)
n = 7 -------------------------answer.

this is an Elementary/Middle school poster, he/she probably does not know how to use logs yet.

note that the prime factorization of 128 will show that:

128 = 2*2*2*2*2*2*2 = 2^7

so 2^n = 2^7

since the bases are the same, the powers must be the same, thus we can equate them. and we get:

n = 7

Thank Ticbol. Thank you for the help.

I told you...?

Do you talk like that to your mom too or just people on the forum? Actually, I am in the 6th grade. I don't like rude people like that guy. So rude. I told you?

Originally Posted by rune2402

I told you...?

Do you talk like that to your mom too or just people on the forum? Actually, I am in the 6th grade. I don't like rude people like that guy. So rude. I told you?

Some of the helpers/masters here sometimes think the askers are as good as they are. But some helpers too take the pains to explain to the most Math-challenged askers even if those in the first group might snicker at it.

Helping those who seek help and solving the Problems only are two different things. It is more difficult to explain as detailed as possible. Solving is easy.

Don't be disappointed in this your first try. Ask some more, anytime.

Thanks Ticbol. See ya later.

Originally Posted by rune2402

I told you...?

Do you talk like that to your mom too or just people on the forum? Actually, I am in the 6th grade. I don't like rude people like that guy. So rude. I told you?

Originally Posted by ticbol

Some of the helpers/masters here sometimes think the askers are as good as they are. But some helpers too take the pains to explain to the most Math-challenged askers even if those in the first group might snicker at it.

Helping those who seek help and solving the Problems only are two different things. It is more difficult to explain as detailed as possible. Solving is easy.

Don't be disappointed in this your first try. Ask some more, anytime.

i see nothing rude about my response. i did not just say "i told you" i proceeded to explain further. furthermore, i gave a simpler solution than ticbol, again with explanation. the helpers here don't want to just give out solutions, they want the student to actually learn, so the often give hints and wait for the poster to try them. you showed no indication that you tried the hints that were given, which was the reason for my response. just asking for solutions won't help you. and as for thinking that other users are as "good as i am," i am guilty of no such thing, and frankly, i do not think any other helper here is, maybe other users, but no helper believes that.

I was just kidding. Hey Jamaica is very nice. Ya Mon.

This is funny though:
The Following 2 Users Say Thank You to Jhevon For This Useful Post: SnipedYou (Yesterday), topsquark (Yesterday)

Heheh. If I say thank you do I get a cookie? Heheh.


Thank you. Sorry for misunderstanding. I'm off to have a red stripe.