1. The problem statement, all variables and given/known data 1. Calculate the gradient of the curve y = 2x3 - 5x2 + 46x + 87 at the point where it crosses the x-axix. 2. Show by differentiation and solving a quadratic equation, that there are no points on the above curve where the gradient is zero. 2. Relevant equations y = 2x3 - 5x2 + 46x + 87 3. The attempt at a solution dy/dx = 6x2 - 10x + 46 It crossess at x-axis where y = 0 ( it it right....?) I then calculate the roots of the equation, and the two roots of x are the points where it crossess the x-axis. How do I do the part 2 problem...?