derivatives lesson oct 14
TRANSCRIPT
Given the following distance time graph represented by the function:
distance
time
x313f (x) = x21
8+
Sketch a graph for the velocity time graph.
velocity
time
Velocity time graph comes from the derivative of the distance time graph.
f '(x) = x2 + x14
acceleration
time
Acceleration describes how fast the velocity is changing with time.
Since f '(x) is a function we can calculate it's derivative:
(f ') ' (a)f ''(a) = f '(a + h) f '(a)
hlimh 0 =
f ''(a) is called the second derivative of f at a
ddx
(dy)dx
d2ydx2
=
also written as:
acceleration
time
Acceleration is the derivative of the velocity curve.
Remember that the derivative of a function tells you whether the function is increasing or decreasing.
Since f '' is the derivative of f '
1. If f ''(x) > 0 on an interval, then f ' is increasing
2. If f ''(x) < 0 on an interval, then f ' is decreasing
Concave UP
When the tangent slopes are increasing the graph of f is concave up
a b
Concave DOWN
When the tangent slopes are decreasing the graph of f is called concave down
a b
Given a function with it's derivative defined as:
f ' (x) = (ln x)2 2(sinx)2 for 0 < x 6<
Graph f ' (x) and it's derivative f '' (x)
a) On which intervals is f increasing?
b) On which intervals is f concave up?
c) Given f (0.1) = 0, sketch a possible graph of f
Given a function with it's derivative defined as:
f ' (x) = (ln x)2 2(sinx)2 for 0 < x 6<
Graph f ' (x) and it's derivative f '' (x)
a) On which intervals is f increasing?
Given a function with it's derivative defined as:
f ' (x) = (ln x)2 2(sinx)2 for 0 < x 6<
Graph f ' (x) and it's derivative f '' (x)
b) On which intervals is f concave up?
Given a function with it's derivative defined as:
f ' (x) = (ln x)2 2(sinx)2 for 0 < x 6<
Graph f ' (x) and it's derivative f '' (x)
c) Given f (0.1) = 0, sketch a possible graph of f
Exercise 2.6
Questions 5, 7, 15, 17, and 19