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Hello there!

For these, you can only add the numbers with the same index. For example, you can add x² and 2x², but not x³ and x².

So here, you can just look based on their indexes:

There are two with an index of 4:

4 and .

You can add those, and you get 5.

There's one with an index of 3: x³. So there's an +x³ in the final equation.

For those with an index of 2, there are two: x² and -x². Those two cancel out just to equal 0.

For just x, there's x, and -x. Those two cancel out as well.

There's the final -1.

So you're looking for:

5 + x³ - 1, or C.