The diagram shows the curve with equation y=f(x), where
f(x)=ax4+4x3−3ax2−21x−18,
and a is a constant. It is given that (x+2) is a factor of f(x).
6(a)Polynomial Division Factor TheoremEasy2 marks
Find the value of a.
a=
6(b)Polynomial Division Factor TheoremMedium3 marks
Show that the positive root of the equation f(x)=0 satisfies the equation x=33x+4.5.
PenEraserUndoRedoClear
Draw with the mouse or a finger.
6(c)Root Finding IterationMedium3 marks
Use an iterative formula based on the equation x=33x+4.5 to find the positive root of the equation f(x)=0 correct to 4 significant figures. Give the result of each iteration to 6 significant figures.