\( f(4) = -16 \)
To find \( x \) when \( g(x) = 2 \), locate the points on the graph of \( y = g(x) \) where \( y = 2 \). The corresponding \( x \)-values are the solutions.
From the graph, when \( y = 2 \), \( x = -1 \) and \( x = 1 \).
If \( g(x) = 2 \), \( x = -1 \) or \( x = 1 \)