Homework Help

When you evaluate any log (base a) b where a > b and b > 1 then: a) log (base a)...

user profile pic

kristenmarieb... | Student, Grade 10 | Valedictorian

Posted August 26, 2013 at 11:35 PM via web

dislike 1 like

When you evaluate any log (base a) b where a > b and b > 1 then:

a) log (base a) b > 1

b) 0 < log (base a) b < 1

c) log (base a) b < 0

d) Cannot be determined 

1 Answer | Add Yours

user profile pic

baxthum8 | High School Teacher | (Level 3) Associate Educator

Posted August 26, 2013 at 11:46 PM (Answer #1)

dislike 0 like

When you evaluate any `log_(a)b`

where a > b and b > 1 we use the definition of logs, which is:

`log_(a)b = x ` is  `a^(x) = b`

If `x < 0;`

then b will be less than 1, however our restrictions state that b > 1.

For instance, if  `5^-1 = .2`

If x = 0, then b = 1, therefore our answer won't include 0.  Also, using the same example:  `5^1 = 5,`

therefore x must have a value less than 1 as 1 makes a = b, but we want a> b.  For instance  `5^0.9 ~~4.257`

Therefore, our correct answer would be choice "b".

Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes