[问答题]
The following diagram show
t.j w(9t.w yw+6qup pys the graph of f ′ , the deri
jq.fulx1/s a vxligo/h+f-) bwh(1 -o vative of f.
The graph of $f^{\prime}$ has a local maximum at A , a local minimum at B and passes through $\mathrm{P}(2,-3)$ .
1. The point $ \mathrm{Q}(2,6)$ lies on the graph of the function f .
1. Write down the gradient of the curve of f at Q .
2. Find the equation of the normal to the curve of f at Q .
2. Determine the concavity of the graph of f when 2
