[填空题]
The following diagram shows the graph of f′7n1 qrgyvy(ipy wnc(+6w/2os, the de pd 0w)m17kea pdq20rqntw+r3 rivative of f.
The graph of f′ has a local maximum at A, a local minimum at B and passes through P(2,−3).
1.The point Q(2,6) lies on the graph of the function f.
1.1Write down the gradient of the curve of f at Q is - .
1.2.Find the equation of the normal to the curve of f at Q, the equation of the normal is given by y=$\frac{a}{b}$x+$\frac{c}{d}$; a= , b= , c= , d= .
2.Determine the concavity of the graph of f when 2
