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#1 2012-01-11 08:03:14
- john111
- Guest
help with exponential
Hello if anybody can explain to me how i plot the graph y=3ekx and y=3e-kx id be very grateful many thanks.
#2 2012-01-11 08:05:35
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: help with exponential
Hi john111;
Welcome to the forum. To plot that you are going to have to reveal what k is.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#3 2012-01-11 08:16:01
- john111
- Guest
Re: help with exponential
hi k is not given i jus need to sketch it so i don't think i have to plot any accurate points on any axis.
#4 2012-01-11 08:27:00
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: help with exponential
Hi;
If you do not know what the shape of the curve is you are going to have to vary k through some values such as 1,1.1,1.2 and plot it as I have done here.
I am assuming the first equation is
Curve gets steeper as k increases.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#5 2012-01-11 08:31:01
- john111
- Guest
Re: help with exponential
thanks bobby and i presume for 3e-kx the the curve is reversed so it is decay rather than growth?
#6 2012-01-11 08:36:31
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: help with exponential
It is a die away curve. It approaches the x axis.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
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