9231 P11 - Jun 2018 - Q4 - 8 marks
5851
It is given that the equation
\(x^{3}-21 x^{2}+k x-216=0,\)
where \(k\) is a constant, has real roots \(a, a r\) and \(a r^{-1}\).
(i) Find the numerical values of the roots.
(ii) Deduce the value of \(k\).
Solutions locked. Please sign in with access to view them.