Question

Set up the following addition using a vertical format and find the sum of the given polynomials.

2mn + 4n 2 and 5m 2 - 7mn

Answer 1

Here's the equivalent "vertical format:"

2mn + 4n^2
-7mn + 5m^2
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Notice how I took pains to arrange like terms in the same column.

Now, "do the math." Add up each column, please. What do you get?