1. The problem statement, all variables and given/known data Find an equation of the tangent line to the curve y=2x-x^2 at the point (2, -4). 2. Relevant equations y=2x-x^2 3. The attempt at a solution I do not have any idea how to do any derivative, other than the equation to do so. Please note that we have been given the answer key - I already know that the solution is y+4=-10(x-2). This is for a Precalculus exam (but I've been informed that derivatives are calculus). I have been absent for a while, which is when we learned about derivatives, so any background information would be nice as well, but the test is tomorrow.