mindjog
DESCRIPTION
Mindjog. Find the domain of each function. Mindjog. Polynomial and rational functions are differentiable at all points in their domain!. Find the domain of each function. Objective: S.W.B.A.T. find extrema on a given interval in order to solve problems for extreme values. - PowerPoint PPT PresentationTRANSCRIPT
Objective: S.W.B.A.T.
• find extrema on a given interval in order to solve problems for extreme values.
Food for thought?????
• What are extrema?• What is the difference between
relative and absolute extrema?• What is true about the
derivative at relative extrema?• What is a critical number?
Finding Extrema
1. Find critical #s of f in (a, b).2. Evaluate f at each critical #.3. Evaluate f at each endpoint.4. Smallest – Abs. min.
Largest – Abs. max.
Extrema on a closed interval
• Find the extrema of each function on the closed interval.
]2,1[,43)(.1 34 xxxf
Extrema on a closed interval
• Find the extrema of each function on the closed interval.
]2,1[,32)(.2 24 xxxf
Extrema on a closed interval
• Find the extrema of each function on the closed interval.
]3,1[,32)(.3 32
xxxf
Extrema on a closed interval
• Find the extrema of each function on the closed interval.
]2,0[,2cossin2)(.4 xxxf
Extrema on a closed interval
• Find the extrema of each function on the closed interval.
]2,1[),25()(.5 3
2
xxxf
Rolle’s Theorem
• Let ƒ be continuous on the closed interval [a , b], and differentiable on the open interval (a, b). If f(a) = f(b) then there is at least one number c in (a, b) such that f’(c) = 0.
Corollary: Rolle’s Theorem
• Let ƒ be continuous on the closed interval [a , b]. If f(a) = f(b) then f has a critical number in (a, b).
Corollary: Rolle’s Theorem
• Let ƒ be continuous on the closed interval [a , b]. If f(a) = f(b) then f has a critical number in (a, b).
Why????????
Using Rolle’s Theorem
• Ex: Find all values of c in the interval (-2, 2) such that f’(c) = 0• 1. Show the function satisfies Rolle’s
Theorem.• 2. Set derivative = 0 and solve.• 3. Throw out values not in interval.
24 2)( xxxf
Mean Value Theorem
• Let ƒ be continuous on the closed interval [a , b], and differentiable on the open interval (a, b) then there exists a number c in (a, b) such that
Mean Value Theorem
• Let ƒ be continuous on the closed interval [a , b], and differentiable on the open interval (a, b) then there exists a number c in (a, b) such that
ab
afbfcf
)()(
)('
Using the MVT
• Ex: For the function f above, find all values of c in (1, 4) such that
xxf
45)(
14
)1()4()('
ff
cf
Application Speeding Ticket
• Two stationary patrol cars equipped with radar are 5 miles apart on a highway. A truck passes the first car at a speed of 55 mph. Four minutes later, the truck passes the second patrol car at 50 mph. Prove that the truck must have exceed the speed limit of 55 mph by more than 10 miles per hour.
Summary…..• What is imperative for the use of
Rolle’s or the Mean Value Theorem?• http://www.ies.co.jp/math/java/calc/rol
hei/rolhei.html
• We now have 3 theorems this chapter. What is the third one?
• What is a critical number?