I'm new to calculus and having a lot of trouble with this question.

Curve y=2x^2-5 has two points P and Q. The abscissa of P is x and Q is x+h.

a) Find the coordinates of P and Q.

b) Using these find the gradient of the secant PQ.

c) Find the gradient of the tangent at P by letting h approach 0.

I've tried different methods but can't seem to pull the correct answer out. Any help would be greatly appreciated