I received this question on finding minimum gradient of a curve and it is confusing for many students as they probably lack the flexibility in seeing gradient beyond dy/dx.
I have presented this question in a slightly different manner by reducing the usage of first derivative (dy/dx) and second derivative (d^2y/dx^2).
Check the 3 minutes video by clicking on the video to find out the step-by-step solutions and the explanations.
Video URL: https://youtu.be/K5-LaQUXo94
httpv://www.youtube.com/watch?v=K5-LaQUXo94