>>10830327Just shift the polynominal sideways, and turn it into a depressed cubic. Then, substitute the unknown variable with the sum of two unknown variables
Next, you should factorize the expression, and arbitrarily set one of the factors to 0, so you get two simple equations in two unknown variables
At this point, the problem simplifies to a + b = c, and a*b = d, so you can solve for a and b in terms of c and d by squaring a + b, subtracting a multiple of the second equation, taking the square root, and then its a matter of solving a syatem of linear equations.
