# Interactive video lesson plan for: 2003 ap calculus frq free response question ab bc #4 Let f be a functoin defined on the closed inter

#### Activity overview:

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Question 4
Let f be a function defined on the closed interval -3 ~ x ~ 4 with
f (O) - 3. The graph of f', the derivative of f, consists of one line
segment and a semicircle, as shown above.
(a) On what intervals, if any, is f increasing? Justify your answer.
(b) Find the ~coordinate of each point of inflection of the graph of f
(c) Find an equation for the line tangent to the graph of f at the
point (O,3).
(d) Find f ( -3) and f ( 4 ) . Show the work that leads to your answers.

Graph of f'

2{

| 1 : x - O and x - 2 only
2: ~
I I : justification

| I : equation

(b) x - O and x - 2
f' changes from decreasing to increasing at
x O and from increasing to decreasing at
_
_

(c) f'(0) = -2
Tangent line is y - -2x + 3.

(d) f (0) - f(-3) = fo_3f '(t)dt
I 1 3
= 2- (I)(I) - ~ (2)(2) = -`2

3 9
f (-3) - f(0) + ~ = ~

f (4) - f (0) - fo4 f '(t) dt
- -(8 - ~ (2)2 7r) - -8 + 27r

f(4) - f(O) - 8 + 2P - -5 + 2P

I : ~(~- 2)
(difference of areas
of triangles)

1 : answer for f(-3) using FTC

I : ~(8 - ~(2)27r)
(area of rectangle
area of semicircle)

1 : answer for f(4) using FTC

Available at apcentral.collegeboard.corn.

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