calc
posted by Brian .
Find the critical number(s) of f(x)= abs(2x4)
What is the derivative of abs(2x4)?
Is it abs(2)?
No. You have to specify the domain of x. At x=2, this function has no derivative.
At x>2, f' = d (2x 4)/dx= 2
at x <2, f'= d(42x)/dx= 2
You have to watch for discontinuities on abs functions.
Respond to this Question
Similar Questions

extreme value of absolute.....
find the extreme values of the function on the interval and where they occur. f(x) = x1x5, 2<=x<=7 How do I do this? 
maths complex numbers
Can abs(287w)=7abs(w) be written as abs(w4)=abs(w) and if so why surely it should be abs(4w)=abs(w) can any one explain why I can just chane the signs Yes, it can be written that way. I don't see that you have changed any signs, … 
Calc
This is a piecewise function on one graph: f(x)= 3, 4 <or= x <or= 1 x+2, 1 < x < 3 x5, 3 <or= x <or= 7 The coordinates are (4,3) (1,3) (3,1) (3,2) (7,2) So what would the graph look like if it is:y= abs(f(x)), … 
math
would this be a correct proof of the cauchyschwartz inequality: abs=absolute value abs(u*v) is less than or equal to abs(u)*abs(v). Then you divide both sides by abs(u)*abs(v) so that you get cos(theta) is less than or equal to 1. 
Calculus
It says find the numbers, if any, at which the given function is discontinuous. f(x)=abs(x+2) *abs  absolute value f(x)=e^xsinx for both of these problems i saw that it was continuous but i don't really know 
12th grade Calculus
It says find the numbers, if any, at which the given function is discontinuous. f(x)=abs(x+2) *abs  absolute value f(x)=e^xsinx for both of these problems i saw that it was continuous but i don't really know 
calculus
Sketch the curve y = x^3  12x^2 + 36x I already did the question properly it is concave down at (0,4) and concave up at (4,infinity) I found the abs max to be (2,32) and abs min to be (6,0) What I wanted to know is when labeling the … 
Absolute Value and Limits
solve for limits of 1+ and 1 for this function: (x^2 + abs (x1)  1)/ abs (x1) i don't know how to simplify abs. value expression times polynomial. can someone please help. 
math
So I need to solve this differential equation dy/dx = 1/(x+2) so i solved it like this dy = 1/(x+2)dx then i took the integral of both sides y= ⌠1/(x+2)dx ⌡ then performed a u sub u = x+2 du = 1dx y = ⌠du/u ⌡ … 
Calculus
Let f(x)= abs of negative abs of x + pi/2 close abs and g(x)= abs of cosx. the wording might be confusing so here is another description of the equation (the "vertical line" that I refer to is the line you draw as you draw the absolute …