Approximate f'(a) in the following ways.
(a) Use the numerical derivative feature of a graphing calculator.
(b) Use f(a + h) - f(a) / h with h = 0.0001
(c) Graph the function on a graphing calculator. Then zoom in near the point until the graph appears straight, pick two points, and find the slope of the line you see.
1. f'(2) for f(x) = 3x4 - 7x - 5
2. f'(- 1) for f(x) = 2x3 - 11x + 9