I'm having a Little bit of trouble in Cubic Functions, especially when i need to graph the Turning Point, Y-intercepts, X-intercepts etc. My class teacher had told us to use Gradient Method:
lets say: $$f(x)=x^3+x^2+x+2$$
We can turn this equation around by using the Gradient Method:
$$f'(x)=3x^2+2x+1$$
so it a quadratic equation. But i would like to find out more about this method too, if anyone knows. Basically i am not good at sketching graphs so if anyone has a website that might help me find out more about cubic functions and how to graph them, or if anyone can help me out, i'll be thankful.
Thanks.