Differential Equations: Growth & Decay (6.2) March 16th, 2012.

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Presentation transcript:

Differential Equations: Growth & Decay (6.2) March 16th, 2012

I. Differential Equations To solve a differential equation in terms of x and y, separate the variables.

Ex. 1: Solve the differential equation. a. b.

II. Growth & Decay Models In applications, it is often true that the rate of change of y with respect to time is proportional to y

Thm. 6.1: Exponential Growth & Decay Model: If y is a differentiable function of t such that y>0 and y’=ky, for some constant k, then y=Ce kt. C is the initial value of y, and k is the proportionality constant. Exponential growth occurs when k>0, and exponential decay occurs when k<0.

Ex. 2: Write and solve the differential equation that models the statement, “The rate of change of N is proportional to N. When t=0, N=250 and when t=1, N=400.” What is the value of N when t=4?

*Recall that for radioactive decay applications, a half-life of 20 years will allow you to find the decay model y=Ce kt with the equation 1/2=e 20k.

*Also, for compound interest applications, the models for growth are when interest is compounded continuously and when compounded n times per year. P=principal amount, r=rate, t=time (in years)