Use the piecewise-defined function to find the following values for $f(x)$.
\[
f(x)=\left\{\begin{array}{ll}
1-2 x & \text { if } x \leq-1 \\
2 x & \text { if }-1< x< 4 \\
4 x+2 & \text { if } x \geq 4
\end{array}\right.
\]
Answer
\(\boxed{\text{The final answer is the function } f(x) \text{ itself, which can be used to find } f(x) \text{ for any given value of } x.}\)
Step 1 ：Given the piecewise-defined function \(f(x)\) as follows:
Step 2 ：\[f(x)=\left\{\begin{array}{ll} 1-2 x & \text { if } x \leq -1 \\ 2 x & \text { if } -1 Step 3 ：We can use this function to find \(f(x)\) for any given value of \(x\). Step 4 ：However, the question does not specify which values of \(x\) we need to find \(f(x)\) for, so we cannot proceed further. Step 5 ：\(\boxed{\text{The final answer is the function } f(x) \text{ itself, which can be used to find } f(x) \text{ for any given value of } x.}\)
