- #1

- 54

- 0

## Homework Statement

At which points on the curve y=1 + 40x^3 - 3x^5 does the tangent line have th largest slope?

## Homework Equations

derivative is 120x^2-15x^4.....

## 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?