Friday

August 1, 2014

August 1, 2014

Posted by **mysterychicken** on Thursday, June 20, 2013 at 11:26am.

1. State the range for the function f(x) = -log 1/2(base) (x-1) + 2

..help?

- math -
**mysterychicken**, Thursday, June 20, 2013 at 11:29amI think its (-infinity, infinity)

- math -
**Steve**, Thursday, June 20, 2013 at 11:37amYou know that the range for log(x) is all real numbers.

Similarly, the range for log_2(x) is all real numbers, since log_2(x) = lnx/ln2

log_(1/2)(x) = -log_2(x) since 1/2 = 2^(-1)

So, log_(1/2)x = -lnx/ln2

log_(1/2)(x-1) is just the same graph, shifted right by 1

log_(1/2)(x-1)+2 is the same graph, shifted up by 2

The range is still all reals.

Visit wolfamalpha.com and type in

log_2(x-1)+2

- math -
**mysterychicken**, Thursday, June 20, 2013 at 11:41amGot it!

- math -
**Jorge**, Thursday, June 20, 2013 at 11:44amThe range is basically all the values that can come out from plugging something in (in other words, every answer that the equation can have). In order to find the range, you need to graph this equation. Once you have the graph, find which point the asymptote(the dashed line) lies. This is the first value that goes into the range. Next, you find which side the actual line goes to. If it goes to the right, then the range is (y coordinate of asymptote, ∞). If it goes to the left, then it is (-∞, y coordinate of asymptote) hope it helps :)

ps. i like your username xD

- math -
**Jorge**, Thursday, June 20, 2013 at 11:45amwell nevermind ._.

- math -
**mysterychicken**, Thursday, June 20, 2013 at 11:46amThanks for the compliment haha

Been using this username on Jiskha for 5 years now

**Related Questions**

Math - So I have a question regarding advanced functions, logarithm stuff. here ...

Precalculus - I'm studying for my precalc exam and have completed 42 practice ...

pre-calculus - What is the domain and range of log3 (1-x)? I will be happy to ...

Algebra 2 - -Explain the difference between log base b (mn) and ( log base b of ...

graphing - How do you graph y= -log (base 5)(-x)? The written question is: ...

log graph - How do you graph y= -log (base 5)(-x)? The written question is: ...

log equation graph - How do you graph y= -log (base 5)(-x)? The written ...

math - write as a single logarithm: -2logbase3(1/x)+(1/3)logbase3(square root of...

Advanced Functions/ Precalculus Log - 1. Evaluate 4^(log base4 64) + 10^(log100...

check! - here is the question: log5(x-4)= log7x solve for x. These are just base...