Compare the Right-Hand and Left-Hand Derivatives to Determine Whether or Not

question 128

Multiple Choice

Compare the right-hand and left-hand derivatives to determine whether or not the function is differentiable at the point whose coordinates are given.
- $$y = x \quad y = 2 x$$

• A) Since \(\lim _ { x \rightarrow0 ^ { + } } f ^ { \prime } ( x ) = - 2\) while \(\lim _ { x \rightarrow 0 ^ { - } } f ^ { \prime } ( x ) = - 1 , f ( x )\) is not differentiable at \(x = 0\).
• B) Since \(\lim _ { x \rightarrow0 ^ { + } } f ^ { \prime } ( x ) = 2\) while \(\lim _ { x \rightarrow - ^ { - } } f ^ { \prime } ( x ) = 1 , f ( x )\) is not differentiable at \(x = 0\).
• C) Since \(\lim _ { x \rightarrow 0^ { + } } f ^ { \prime } ( x ) = 1\) while \(\lim _ { x - \theta ^ { - } } f ^ { \prime } ( x ) = 2 , f ( x )\) is not differentiable at \(x = 0\).
• D) Since \(\lim _ { x \rightarrow0^ { + } } f ^ { \prime } ( x ) = 1\) while \(\lim _ { x - \theta ^ { - } } f ^ { \prime } ( x ) = 1 , f ( x )\) is differentiable at \(x = 0\).

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