Question

How do you do this limit problem??

Answer 1

they show the *definition* of f'(1) = 3

we see f'(1) is defined, so f is differentiable at x=1 . A is true
f'(1)=3 contradicts B. B is not true
f might have a removable discontinuity, but it does not have to. C is false

Answer 2

it can't have a removable discontinuity

differentiability \(\Rightarrow\) continuity

Answer 3

Thank You phi!