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the given function is $f(x)=b * a^{-x} + c$
the 2 given points are N(1|0) and M(0|2)


What I did so far was inserting the points in the function and solve after c
so I got $c=-\frac{b}{a}$ and $c=b-2$

I don't know how to proceed at this point, can someone explain the next steps?


the given solution from the book is $f(x)=4*2^{-x}-2$
thanks!

Lucas
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  • You can't. you have three parameters and only two equations. –  Oct 30 '16 at 16:17
  • so theres a printing error on the sheets, thank you! – Lucas Oct 30 '16 at 16:22
  • For instance $$\begin{cases} 5\cdot\left(\frac53\right)^{-1}-3=0\ 5\cdot\left(\frac53\right)^{-0}-3=2\end{cases}$$ –  Oct 30 '16 at 16:24

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