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The image set is a closed interval {- 12, infinity} Sorry no square brackets and no sign for infinity.

I am asked to explain why the function of f does not have an inverse?

Given that the graph is a parabola I would have thought that the graph did have an inverse?

The domain {-3

__<__x

__<__1}

I am missing something here in the understanding if anyone can advise It would be much appreciated.

Sorry I didn't include a sketch the paint package won't allow me to draw a curve