Respuesta :

AlgebraicAardvark

f(x) = 4 means "y=4".

If you draw in y=4 as a line on the graph, you're looking for points where the f(x) graph hits y=4.  (see picture below)

This happens at one point and the x-value of that point is -2.

-2 is the only x-value where this happens.

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