1. The problem statement, all variables and given/known data At which points on the curve y=1 + 40x^3 - 3x^5 does the tangent line have th largest slope? 2. Relevant equations derivative is 120x^2-15x^4..... 3. The attempt at a solution how should i do this? start by setting the derivative equal to zero to find critical #s, but then what?