For the function
I find the derivative to be:
and I need to set the derivative to equal 0 for this question I'm doing, I would guess I need to use the quadratic formula to do this (if this is wrong please let me know)
But when I use the quadratic formula I get this far:
which gives me:
Which can't be right since you can't take the sqrt of a negative number....please help!
the actual question is:
for the function , determine:
a) the intervals of increase or decrease
b) the location of any max or min points
c) the intervals of concavity up or down
d) the location of any points of inflection
I've done other questions like this but I've always gotten the derivative to equal 0, so I never had any problems.
for (a) I need set the derivative to equal 0 so I can figure out the x's and know which intervals I need to look at to see where the function is increasing and decreasing.