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Q: Exponential Growth/Decay ( No Answer,   3 Comments )
Subject: Exponential Growth/Decay
Category: Reference, Education and News > Homework Help
Asked by: goobygoo-ga
List Price: $4.00
Posted: 23 Aug 2006 18:52 PDT
Expires: 22 Sep 2006 18:52 PDT
Question ID: 758941
My son (in Algebra 2) has been given an assignment asking him to tell
whether several different equations show exponential growth or decay,
and to JUSTIFY. Some examples are:
Can somebody explain how to figure out (at the 9th grade level)
whether a certain equation shows growth or decay? And since you can't
use a calculator, I cannot simply graph it to justify my answer.
There is no answer at this time.

Subject: Re: Exponential Growth/Decay
From: jack_of_few_trades-ga on 24 Aug 2006 05:00 PDT
Plug in different values for x.  

If when X increases the solution increases, then you have growth.  
If when X increases the solution decreases, then you have decay.
Subject: Re: Exponential Growth/Decay
From: frde-ga on 24 Aug 2006 05:54 PDT
Er.. Jack, do you not mean the implicit Y ?
Subject: Re: Exponential Growth/Decay
From: jack_of_few_trades-ga on 24 Aug 2006 06:27 PDT
Sure, you can call it an implicit Y.  However I'd just assume to
ignore the need to have an equals sign and a variable on the other
side of the equation... and simply simplify what you have.

Kinda like...
What is 2 X 4
392Y + 219Y

In either case, any reasonable math person knows they can simplify
things without the need of an equals sign.

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