Jessenia Lema Tangent Lines with Derivative Rules Nov 02, 7:50:55 PM Watch help video Let f be a differentiable function with f(-1) = -2, f'(-1) = 1, f(8) =5, and f (8) = -4. Let the function g(x) = f(3x2 + 5). Write the equation of the line tangent to the graph of g at the point where x = -1