2.7/2.8 Tangent Lines & Derivatives
P = (a, f(a)) with a slope of, Tangent Line The line through P = (a, f(a)) with a slope of,
The derivative of f at a is f(a):
Find the slope of the tangent line at x = 4. Ex 1: Find the slope of the tangent line at x = 4. Find the slope of the tangent line at x = a.
Ex 2: Find f (x) and use it to find the equation of the tangent line to f (x) at x = 9.
Average Velocity: the slope of the secant line between two points, P & Q, on a position curve. Don’t Forget!
Instantaneous Velocity: the slope of the tangent line to a point P on a position curve. Don’t Forget!
2.7 pg. 154 # 1, 2, 3, 5, 11, 13, 15, 25
NOTE: f(x) = the slope of the tangent line at x s(a) = the velocity at t = a | s(a)| = the speed at t = a
Ex 3: The displacement (in meters) of a particle moving in a straight line is given where t is seconds.
a) Find the average velocity on the interval [4, 4 a) Find the average velocity on the interval [4, 4.5] b) Find the instantaneous velocity at t = 4 c) Find the speed at t = 5
Let P(t) be the population of the United States at time t, in years. Ex 4: Let P(t) be the population of the United States at time t, in years. What are the units of P(t)? What does P(1992) = 2.7 million mean?
Ex 5: Sketch the graph of the function g for which g(0) = 0, g(0) = 3, g(1) = 0, & g(2) = 1.
Ex 6: The limit represents the derivative of f at some number a. State f and a.
The limit represents the derivative of f at some Ex 7: The limit represents the derivative of f at some number a. State f and a.
2.8 pg. 161 # 1, 3, 4, 5, 13, 15, 19 – 24 all, 25, 27, 28, 31