# Thread: Simple Question about Crictical Numbers

1. ## Simple Question about Crictical Numbers

Consider the funciton: $f(t)=\mid 3t-4 \mid$,

This function is not differentiable where $f'(t)$ does not exist. This would be at $3t-4=0$. By this reasoning, $\frac{4}{3}$ is a critical number correct?

2. Originally Posted by adkinsjr
Consider the funciton: $f(t)=\mid 3t-4 \mid$,

This function is not differentiable where $f'(t)$ does not exist. This would be at $3t-4=0$. By this reasoning, $\frac{4}{3}$ is a critical number correct?
Look up the definition you have been given for critical point.

If it a point x=c where f is defined and either f'(c)=0 or f'(c) is undefined, then yes.

CB