Answering questions on derivatives

I am having serious issues in memorising the formulas as given in CFAI, but find the graphical approach a lot more palatable and can get to answers with more confidence using the graphs.

Would CFAI appreciate the methods wherein I use less jargon and formulas but use numbers from graphs and solve them - could not find a discussion on this so putting up a question. Also, I hope I am not a significant minority with this graphical bias … :slight_smile: