Question

Ms. Millie showed the graphs of the functions y=log2x and y=log4x to her students. Which conclusion is incorrect?

A. The x-intercept of each graph is 0

B. The graphs never intersect the y-axis

C. The domain of each function is {x:x>0}

D. The range of each function is {y: all real numbers}

Answer 1

I am not quite sure, but I think it is the letter B?

Answer 2

graph them, look at them

Answer 3

okay, by definition, what is log(a)?

Answer 4

I don't know how to put the 4 in TL-84 calculator

Answer 5

Log is a power

Answer 6

log(a)=x is the solution to the equation e^(x)=a.

Answer 7

is e you mean lnx?

Answer 8

e is exponential.

Answer 9

Oh, okay...

Answer 10

So if you substitute in your question x=0, you get log0. What is log 0?

Answer 11

e^o=1

Answer 12

um, i have confused you a little bit, the two x's are different.

Answer 13

in your problem you're looking for
log x=a
log 0=a

e^(which power)=0

Answer 14

yes

Answer 15

okay, so it should be clear that there is no power of e that will give you 0. So the answer to your question is A.

Answer 16

Thank you

Answer 17

I'm more concerned about you understanding it, than getting the answer. Is everything clear?