The diagram shows the graph of `y = f(x)` over the domain `-2 leq x leq 4`.
The function can be expressed as `f(x) = ax3 + bx2`, where `a` and `b` are integers.
Find the value of `a` and `b`.
Using the graph, or otherwise, solve the equation `f(x) = 6`, giving your answer(s) to `1` decimal place.
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