David W. answered • 06/08/15
Tutor
4.7
(90)
Experienced Prof
Although it is certainly “fair game” to ask such a question to determine whether you understand the concept, I always feel silly when I find out the answer – sort of like a little kid’s joke.
The concept of function is important – there is, at most, one y for each x.
An inverse function is also a function, but it goes the other way: there is., at most, one x for each y.
O.K., since g is the inverse function of f and f(2) = 6 then g(6)=2. (this seems silly to me)
Now, just to confuse us, the question writer gave TMI (too much information) with the part that says F(6)=5. That has nothing to do with our solution (unless you don’t understand the problem).
The concept of function is important – there is, at most, one y for each x.
An inverse function is also a function, but it goes the other way: there is., at most, one x for each y.
O.K., since g is the inverse function of f and f(2) = 6 then g(6)=2. (this seems silly to me)
Now, just to confuse us, the question writer gave TMI (too much information) with the part that says F(6)=5. That has nothing to do with our solution (unless you don’t understand the problem).
David W.
To Mark M., Thanks for you concern. I wanted to relate to a student who is about to realize how super-simple this concept is; the light bulb goes on (and you feel like the teacher is not teaching, but tricking you -- like a little kid's joke).
My oldest memory of such an incident was sixth grade and I stood to define a word on the vocabulary list on the board. I pronounced fatigue as FAT-E-GU and the class erupted in laughter.
True story: A Marketing Executive was presenting PowerPoint slides about his company's software expertise and read the bullet as "Our Company is Experienced at Fours and Fives," but the bullet showed IV&V (Independent Verification & Validation). The commanding general wasn't impressed.
Report
06/08/15
Mark M.
06/08/15