Parabola and the tangent line at a moving point

MathematicsCalculusAges 16–17

The graph of y = ax² + bx + c has a point M that moves along the parabola. Drag M with the mouse or a finger; the tangent line at M is drawn from the slope y'(x) = 2ax + b, showing the coordinates of M, the slope, and the equation of the tangent line.