By subtracting the given addend to the sum, we see that the other addend is:

<h3>
How to get the other addend?</h3>
We know that the sum of two polynomials is:

One of the addends is:

To get the other addend, we can subtract the given addend to the sum:

Then we can conclude that the other addend is:

If you want to learn more about polynomials:
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IDK your SOL sorry
SOL means sorry out of luck
For the question in the picture: cross multiply.
X1 X2
---- = ----- = X2X3=X1X4
X3 X4