Firstly this question relates to an assignment so please do not provide answer.
I am asked to find the roots of a function which appears to be a cubic function.
I am given a graph which clearly shows 3 roots, which are approx -2, 0 and 5. However I need to work out the exact points.
I have read the The "Cubic Formula" which talks about the cubic formula however I honestly cannot get my head around it. Does anyone know of a better link which explains it better or can explain it better ?
Unfortunately the book I have been given doesn't touch on this formula.