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When you add polynomials, you simply add the coefficients of the variable taken to the same degree. For example

(x3 + 2x2 + 3x + 4) added to (2x3 - 4x2 + x -2) would give you

[(1+2)x3 + (2-4)x2 + (3+1)x + (4-2)] or

3x3 - 2x2 + 4x + 2

You would get a fourth degree polynomial by multiplying this one by x.

Another way to think of it: If you add 1 apple and 3 apples (like one times x2 and 3 times x2) you still get apples, not watermelons.

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