Hi,

I know this question is easy but I havent done this topic in awhile and I forget how to do it.

$\displaystyle f(x)=-0.1x^3 -0.26x^2 + 0.861x + 1.539$

I need to sketch the tangent lines to y=f(x) at x=-3 and x=2?

How do I work out the tangent line?

Please