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.
Multiply both sides by to get rid of the fraction...
Now factorise and use the Null Factor Law to solve for .
So or .
The first root is obvious, the other 2 require either completing the square or using the Quadratic Formula...
So the three roots are