9231 P1 - Nov 2009 - Q5
6594
The equation
\(x^{3}+5 x+3=0\)
has roots \(\alpha, \beta, \gamma\). Use the substitution \(x=-\frac{3}{y}\) to find a cubic equation in \(y\) and show that the roots of this equation are \(\beta \gamma, \gamma \alpha, \alpha \beta\).
Find the exact values of \(\beta^{2} \gamma^{2}+\gamma^{2} \alpha^{2}+\alpha^{2} \beta^{2}\) and \(\beta^{3} \gamma^{3}+\gamma^{3} \alpha^{3}+\alpha^{3} \beta^{3}\).
