Sunday

April 20, 2014

April 20, 2014

Posted by **greeny** on Monday, May 21, 2012 at 10:35pm.

how do i solve for this? thanks!

- math -
**Jai**, Monday, May 21, 2012 at 10:38pm2^x + 1 = 9

2^x = 9 - 1

2^x = 8

then we rewrite 8 as power of 2:

2^x = 2^3

finally, since they have the same base (which is 2) we equate their exponents:

x = 3

hope this helps~ :)

- math -
**greeny**, Monday, May 21, 2012 at 10:44pmsorry, the plus one is part of the exponent

2^(x+1) =9

is it possible to move the 1 to the otherside still?

- math -
**Jai**, Monday, May 21, 2012 at 10:52pmOh sorry. I thought it's outside. Nope, it can't be moved outside.

2^(x+1) = 9

2^(x+1) = 3^2

then we take the log of both sides:

(x+1)*(log 2) = 2*(log 3)

x + 1 = 2(log 3) / (log 2)

x = [2(log 3) / (log 2)] - 1

or we can also rewrite the 1 as (log 2)/(log 2), so

x = [2(log 3) - (log 2)] / (log 2)

hope this helps~ :)

**Related Questions**

English - 1. He can not solve the math problem. 2. He cannot solve the math ...

Math - How do you solve for d? 16d - (4 - 5d) = -67 How do you solve for m? 2/7(...

Math - We have an important chemsitry test due and I want to make sure that I do...

math - actually, in a addition to the question i posted a few minutes ago, can ...

MATH PLEASEEEEE - I have a question, if f(x)=x/2 and g(x)=3x+1 find: a) (f+g)(x...

Math - Solve for S: r^2s-5s=7. Solve for b: L= 4a^2b. I'm confused about how to ...

MATH PLEASE HELP! - Solve each system 3x+2y= -2 9x- y= -6 I know how to solve ...

math - solve for the indicated variable: a. temperature formula solve for F: K=5...

Math Analysis - 6. Prove that f(x) = (3/4)x^4 + 2 and g(x) = (4sqrt(108x-216))/3...

English - 1. However brilliant she is, she won't be able to solve this math ...