Sketch a graph of a rational function that satisfies the following conditions: (4 marks)
f(0)=0,f(4)=-6,f(6)=-9
f^(')(0)=f^(')(6)=0
f^(')(x)<0 for x<0 and 00 for x>6
f^('')(0)=f^('')(4)=0
f^('')(x)<0 for 00 for x<0 and x>4
Points
,(0,0),(4,-6),(6,-9)
Concavity: Concave up for
x<0
and
x>4
concave doun for
x<6x>6(0,0)(4,-6)0
Incldec: Decrease in x<6
increase in x>6
inflection Points: (0,0)(4,-6)