
Victoria L. answered 11/21/24
Experience Teaching Assistant: Math, Science, Programming
Uninhibited Growth and Decay models:
Things that grow or decay proportionally to itself, with no limits, is known as "uninhibited" growth/decay.
Uninhibited Growth in Algebra 2
The uninhibited growth formula is A(t) = A0ekt, where A0 is the initial value, k is the growth factor, and t is the amount of time. If you have something like a doubling time, but no growth factor, you can solve for the growth factor by plugging in A(t), A0, and t, and solving for k.
Derivation from Calculus/Differential Equations
The derivation of the model from algebra 2 starts with the original equation based on the definition:
growth proportional to initial amount, with no limits. This yields the following:
dA/dt = kA --the rate of growth over time is k, some proportion [the growth rate] multiplied by A, the population.
This evaluates to our earlier equation A(t) = A0ekt.
For a growth model, k > 0, and in a decay model, k<0.