1. **State the problem:**
We have the function $g(x) = \log_2(4x)$ with $x > 0$. We need to find values of $g(4)$ and $g(\frac{1}{4})$, find the inverse function $g^{-1}(x)$, evaluate $g^{-1}(1)$, and describe the transformations for $y = g(x^2)$ from $y = \log_2 x$.
2. **Find $g(4)$:**
$$g(4) = \log_2(4 \times 4) = \log_2(16)$$
Since $16 = 2^4$,
$$g(4) = 4$$
3. **Find $g(\frac{1}{4})$:**
$$g\left(\frac{1}{4}\right) = \log_2\left(4 \times \frac{1}{4}\right) = \log_2(1)$$
Since $\log_2(1) = 0$,
$$g\left(\frac{1}{4}\right) = 0$$
4. **Find the inverse function $g^{-1}(x)$:**
Start with
$$y = \log_2(4x)$$
Rewrite in exponential form:
$$2^y = 4x$$
Solve for $x$:
$$x = \frac{2^y}{4}$$
Using cancellation,
$$x = \frac{2^y}{\cancel{4}} = 2^{y-2}$$
So,
$$g^{-1}(x) = 2^{x-2}$$
5. **Find $g^{-1}(1)$:**
Substitute $x=1$ into the inverse:
$$g^{-1}(1) = 2^{1-2} = 2^{-1} = \frac{1}{2}$$
6. **Describe transformations for $y = g(x^2)$ from $y = \log_2 x$:**
- Start with $y = \log_2 x$.
- Replace $x$ by $x^2$ to get $y = \log_2(x^2)$, which reflects a horizontal compression and symmetry about the y-axis.
- Then apply $g(x) = \log_2(4x)$, which multiplies the input by 4 inside the log, shifting the graph horizontally.
- So the combined transformation is:
1. Horizontal compression by squaring $x$.
2. Horizontal shift/compression by factor 4 inside the log.
**Final answers:**
(i) $g(4) = 4$
(ii) $g(\frac{1}{4}) = 0$
(b) $g^{-1}(x) = 2^{x-2}$
(c) $g^{-1}(1) = \frac{1}{2}$
(d) Transformations: replace $x$ by $x^2$ (horizontal compression and symmetry), then multiply input by 4 inside the log (horizontal scaling).
Logarithm Inverse 2E9B8F
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