2^5

[Muaazz]

2^5.....how do u solve these type of questions....i am not so good at indices!! :/

 

[notnek01]

2^5.....how do u solve these type of questions....i am not so good at indices!! :/

2^2 = 2 x 2 = 4
2^3 = 2 x 2 x 2 = 8
...
2^5 = 2 x 2 x 2 x 2 x 2 = 32

 

[Muaazz]

dude sorry...em not good but em not tht bad...............2^n=0.125......i wz jst trying to gain sum attention

 

[Muaazz]

2^n=0.125
find n!!

 

[notnek01]

dude sorry...em not good but em not tht bad...............2^n=0.125......i wz jst trying to gain sum attention

I thought that wasn't your question

First write 0.125 as a fraction : 1/8

Then write 1/8 as a power of 2:

1/8 = 1/2^3 = 2^(-3)

So what's n?

 

[Muaazz]

nthe question is tht we aresupposed to find n!!

 

[notnek01]

nthe question is tht we aresupposed to find n!!

I know. My post above was the working that you need to find n!

2^n = 0.125 --> 2^n = 2^(-3)

What's n?

 

[Muaazz]

1/2^3 i did not understand this1!!elaboration plzz!!

 

[notnek01]

1/2^3 i did not understand this1!!elaboration plzz!!

Here I mean "1 over 2 cubed". I should've used brackets:

1/(2^3)

Can you see why this is the same as 1/8 ?

 

[Muaazz]

no!do u have a link to some worked out examples!!???

 

[notnek01]

1st u write 0.125 as a fraction 1/8

wt do u do nxt??

8 = 2^3 (2 cubed)

So 1/8 = 1/(2^3)

(The symbol ^ means "to the power of".)

 

[Muaazz]

wt do u mean by "2 cubed"??

 

[notnek01]

wt do u mean by "2 cubed"??

"2 cubed" means "2 to the power of 3".

8 = 2 x 2 x 2 = 2^3

 

[Reddah Nadeem]

2^5=2x2x2x2x2

 

[Reddah Nadeem]

"2 cubed" means "2 to the power of 3".

8 = 2 x 2 x 2 = 2^3

Yes You Are right

 

[Muaazz]

I GET IT..... thnx aloot!! .........now 2^4n * 2^2n =512

how do u find tht n!!

 

[notnek01]

I GET IT..... thnx aloot!! .........now 2^4n * 2^2n =512

how do u find tht n!!

When you multiply two powered numbers, you add the powers so:

2^(4n) * 2^(2n) = 2^(4n + 2n) = 2^(6n)

Also, 512 = 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 = 2^9


So you can rewrite the original equation 2^4n * 2^2n =512 :

2^(6n) = 2^9

Can you finish it from here?

 

[notnek01]

2^4n * 2^2n = 512
2^4n+2n = 512
2^6n = 512
64n = 512
n = 512/64
n = 8
wait. somethings wrong..

2^(6n) is not the same as 64n

Unless you mean 2^6 * n.

But I think 2^4n * 2^2n = 512 means

2^(4n) * 2^(2n) = 512.

 

[Reddah Nadeem]

2^n=0.125
2^n=2^-3 (See the powers)
n=-3