
Concept explainers
To Graph:The several members of the family.

Answer to Problem 26E
Explanation of Solution
Given: The family of functions f(t)=C(e−at−e−bt) where a,b,c are the positive numbers b>a has been used to model the concentration of a drug injected into the blood-stream at a time t=0 .Graph the several members of the family. What do they have in common? For fixed values of C,a discover graphically what happens as b increases. Then use calculus to prove what you have discovered.
Given: f(t)=C(e−at−e−bt)
The graph for the function as b increases is
Differentiating
ddt(C(e−at−e−bt)=C(be−bt−ae−at)
Thus
ae−at0=be−bt0
Taking log both sides
lnae−at0=lnbe−bt0lnba=(b−a)t0t0=lnbab−a
Differentiating with respect to b
dt0db=b−ab−lnba(b−a)2−1ab<0dt0db<0
Here the function reaches at the maximum point.
Now,
f(t0)=C((ba)−ab−a−(ba)−bb−a)thendf(t0)db=(ba)−bb−aln(ba)b−a
That means it is always greater than zero as b>a so the value of the function as its maximum increases as b increases.
Chapter 4 Solutions
Single Variable Calculus: Concepts and Contexts, Enhanced Edition
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