Please help me solve these two questions

The function k(x) : is differentiable everywhere but x = 0. Why is it not differentiable at x = 0? What is k'(1) ? HINT: you do not need to make any computations here. Just look at the graph and think slopes of secant lines. .. k' (1 ) = _ 4 BOTTOM LINE QUESTION Given g(x) = - find its derivative function 8 . Show your work and answer on the back of this 1-x sheet