Start with the graph of $f(x)=7^{x}$. Then write a function $g(x)$ that results from the given transformation. reflect $f(x)$ about the $x$-axis \[ g(x)=-6 x \]

Step 1 ：The given function is \(f(x) = 7^{x}\).

Step 2 ：We are asked to reflect this function about the x-axis.

Step 3 ：A reflection about the x-axis changes the sign of the function, so the transformed function \(g(x)\) is \(-f(x)\).

Step 4 ：Substituting \(f(x)\) into the equation gives \(g(x) = -7^{x}\).

Step 5 ：So, the function \(g(x)\) that results from reflecting \(f(x) = 7^{x}\) about the x-axis is \(\boxed{g(x) = -7^{x}}\).