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C3 Natural Exponential

What is it :s-smilie: i know its a number, the e thing, but what are the rules when working out equations with it, im really confused and havent got a textbook yet
help :smile:
aspire2inspire
What is it :s-smilie: i know its a number, the e thing, but what are the rules when working out equations with it, im really confused and havent got a textbook yet
help :smile:


All ln rules apply, so things like

x=e^y <=> lnx=y
I presume you're doing C3 and so learnt these laws ast year.

If you're solving an equation there are different methods which are appropriate at different times, e.g. substitution, or using the laws of logs.
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jthb
f(x) = e^x

df(x)/dx = e^x
aspire2inspire
What is it :s-smilie: i know its a number, the e thing, but what are the rules when working out equations with it, im really confused and havent got a textbook yet
help :smile:

If this is C3, questions including e^x (e is a number around 2.718) and lnx will probably be on sketching graphs, finding asymptotes, or solving for x.

Because lnx is the natural log (base e) all log rules apply as previously mentioned, and these are probably what will help you most.

f(x) = e^x is the exponential function, where its gradient is equal to itself (see previous post.)

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