1. **State the problem:** We need to graph the exponential function $$f(x) = - \left(\frac{3}{5}\right)^{-x}$$ and plot five points on its graph, as well as draw the horizontal asymptote.
2. **Recall the formula and properties:** The function is an exponential function with base $$\frac{3}{5}$$ raised to the power $$-x$$, and multiplied by a negative sign. Important rules:
- For any base $$a$$ where $$0 < a < 1$$, $$a^{-x} = \left(\frac{1}{a}\right)^x$$ which is an increasing exponential function.
- The negative sign in front reflects the graph across the x-axis.
- The horizontal asymptote of $$a^x$$ is $$y=0$$, so here it remains $$y=0$$.
3. **Simplify the function:**
$$f(x) = - \left(\frac{3}{5}\right)^{-x} = - \left(\frac{5}{3}\right)^x$$
4. **Calculate five points:**
- At $$x=0$$: $$f(0) = - \left(\frac{5}{3}\right)^0 = -1$$
- At $$x=1$$: $$f(1) = - \frac{5}{3} \approx -1.6667$$
- At $$x=2$$: $$f(2) = - \left(\frac{5}{3}\right)^2 = - \frac{25}{9} \approx -2.7778$$
- At $$x=-1$$: $$f(-1) = - \left(\frac{5}{3}\right)^{-1} = - \frac{3}{5} = -0.6$$
- At $$x=-2$$: $$f(-2) = - \left(\frac{5}{3}\right)^{-2} = - \left(\frac{3}{5}\right)^2 = - \frac{9}{25} = -0.36$$
5. **Describe the asymptote:** The horizontal asymptote is $$y=0$$, which the graph approaches but never crosses.
6. **Summary:** The graph is a decreasing negative exponential curve approaching zero from below, passing through the points calculated.
**Final answer:** The function is $$f(x) = - \left(\frac{5}{3}\right)^x$$ with horizontal asymptote $$y=0$$ and points at $$(0,-1), (1,-1.6667), (2,-2.7778), (-1,-0.6), (-2,-0.36)$$.
Exponential Graph 75E0D5
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