Help On A Question (1 Viewer)

[ezza]

I dont get question 8.c from this past paper

http://www.boardofstudies.nsw.edu.au/hsc_exams/hsc2000exams/hsc00_maths/99MATH23.PDF

thnx ^^

 

[roo]

aahh those weird graphy f'(x) things.. they scare meee.. lol, i always get them wrong..

is the answer x=5 ?

 

[Smurfwow]

I would say x = 5

is this what f(x) would look like?

 

[ezza]

how did u guys get that answer?

ive never seen this type of question in any of my textbooks

 

[p00_p00]

Well the graph is of the first derivative. And when the graph hits the x axis, thats when it has a turning point. So when the gradient goes from negative, 0 to positive, thats when their is a min!

 

[enzi`]

i think smurf's correct, nice drawing btw!