Evaluate the Function for the Indicated Value, Then Simplify

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This video goes over 1 example on how to evaluate a function when using a non-numeric value.

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This video was mostly helpful, but there are two things I want to point out. I am a very slow learner and need details clearly stated so this isn't on you, it's on me.
1. I don't understand where the 2x came from. X^2 makes sense, and so does the +1, but for me, it is unclear where the 2x comes from.
2. At the end for +3 you spoke 'minus three' and for slower people like myself, we might question if there was some kind of process change that transitioned it from adding three to subtracting three in the final simplification.

Thanks!

Shoova
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Ngl i thought she was floating at first 💀

Izzie_j