[SOLVED] Basic Differentiation Hi there, I've heard that this forum is the best for getting some quick help. Find the gradient of the tangent to the curve at the given point: y = 2x² + 3x + 5 when x = -1 2. Relevant equations Right, I'm very new a this, but dy/dx is the way to go right? 3. The attempt at a solution: y = 2x² + 3x + 5 when x = -1 dy/dx it, and I get: dy/dx=4x + 3 Substitute -1 in and I get y=-1 So I've now got two points; (-1,-1) but thats not the gradient, but I've got the feeling I'm half way there. Any help would be great thanks!