249 views

Let $f(x)= |x|^{3/2}, x \in \mathbb{R}$. Then

1. $f$ is uniformly continuous.
2. $f$ is continuous, but not differentiable at $x=0$.
3. $f$ is differentiable and $f '$ is continuous.
4. $f$ is differentiable, but $f '$ is discontinuous at $x=0$.
asked in Calculus | 249 views
Answer is option B because when we draw  graph of the given function there is a cusp at x=0 and the function is continuous at x=0. whenever we have cusp at a point then at that point the fuction is not differentiable..

f is differential & first derivative of f is discontinuous at x =0
can u solve it ..

The graph for $f(x) = |x|^{\frac{3}{2}}$ looks like :

And the plot of its derivative is :

Clearly : option D

f(x) is not continuous because the domain is all R, but the plot is only possible for positive real numbers.

More insight here,

http://www.wolframalpha.com/input/?i=y%3D|x|^(3%2F2)

I think answer should be B

Why left part is not imaginary like this

What will be the definition of this function

$$f(x) = \begin{cases} x^{3/2} &\text{ for }x \geq 0 \\ (-x)^{3/2} &\text{ for } x<0 \end{cases}$$

OR

$$f(x) = \begin{cases} x^{3/2} &\text{ for }x \geq 0 \\ -(x^{3/2}) &\text{ for } x<0 \end{cases}$$ ?

i think the first breakdown of function is correct beacause we wont be able to take the square root of negative number...
Any reference?

+1 vote