1. **State the problem:** We are given the function $$f(x) = \frac{2}{3} \cdot 3^{3x + 12}$$ and want to understand its behavior and graph.
2. **Recall the exponential function form:** The general form is $$f(x) = a \cdot b^{cx + d}$$ where $a$ is a coefficient, $b$ is the base of the exponential, and $cx + d$ is the exponent.
3. **Identify components:** Here, $a = \frac{2}{3}$, $b = 3$, $c = 3$, and $d = 12$.
4. **Key properties:**
- Since $b=3 > 1$, the function is an increasing exponential.
- The coefficient $\frac{2}{3}$ scales the output vertically.
5. **Find the y-intercept:** Set $x=0$:
$$f(0) = \frac{2}{3} \cdot 3^{3 \cdot 0 + 12} = \frac{2}{3} \cdot 3^{12}$$
6. **Simplify $3^{12}$:**
$$3^{12} = 531441$$
7. **Calculate $f(0)$:**
$$f(0) = \frac{2}{3} \times 531441 = 2 \times 177147 = 354294$$
8. **Horizontal asymptote:** Since the base is greater than 1 and the exponent grows without bound, as $x \to -\infty$, $f(x) \to 0$.
9. **Summary:** The graph is an increasing exponential starting near zero for large negative $x$, passing through $(0, 354294)$, and increasing rapidly for positive $x$.
Exponential Function E7904C
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