Ok, I need help understanding this really bad. I don't get it. There were examples of derivatives in the book but I don't get how they got the answer. Here were the examples. They all said to find the derivatives algebraically. f(x)=x[tex]^3[/tex] at x=-2 The answer was 12. f(x)=x[tex]^3[/tex]+5 at x=1 The answer was 3. How did they get these answers, I don't understand it, can someone help explain?