Paper 1 Number 4 first part, where I have to show that the sum of the cubes of the roots is -3. I know the sum of the roots and the sum of the squares of the roots but how do I find the sum of the cubes? Any help please? Here is the question...
Show that the sum of the cubes of the roots of the equation
x3 + λ x + 1 = 0
is −3.
Show that the sum of the cubes of the roots of the equation
x3 + λ x + 1 = 0
is −3.