1. **State the problem:**
We are given two functions:
$$h(x) = \frac{10}{x - 3}$$
and
$$g(x) = 3x - 2$$
We need to evaluate some function values and find expressions for inverse and composite functions.
2. **Evaluate (a)(i) $g(4)$:**
Substitute $x=4$ into $g(x)$:
$$g(4) = 3(4) - 2 = 12 - 2 = 10$$
3. **Evaluate (a)(ii) $h(g(4))$:**
First, find $g(4)$ from step 2, which is 10.
Now substitute into $h(x)$:
$$h(g(4)) = h(10) = \frac{10}{10 - 3} = \frac{10}{7}$$
4. **Find (b)(i) the inverse function $h^{-1}(x)$:**
Start with:
$$y = \frac{10}{x - 3}$$
Swap $x$ and $y$ to find inverse:
$$x = \frac{10}{y - 3}$$
Multiply both sides by $y - 3$:
$$x(y - 3) = 10$$
Distribute:
$$xy - 3x = 10$$
Add $3x$ to both sides:
$$xy = 10 + 3x$$
Divide both sides by $x$:
$$y = \frac{10 + 3x}{x}$$
This is the inverse function:
$$h^{-1}(x) = \frac{10 + 3x}{x}$$
5. **Find (b)(ii) the composite function $gg(x)$:**
This means $g(g(x))$.
Start with:
$$g(x) = 3x - 2$$
Substitute $g(x)$ into $g$:
$$g(g(x)) = g(3x - 2) = 3(3x - 2) - 2 = 9x - 6 - 2 = 9x - 8$$
**Final answers:**
- $g(4) = 10$
- $h(g(4)) = \frac{10}{7}$
- $h^{-1}(x) = \frac{10 + 3x}{x}$
- $gg(x) = 9x - 8$
Function Evaluation 4895Ab
Step-by-step solutions with LaTeX - clean, fast, and student-friendly.