1 Answer

Romko · Answer 1 · 2019-09-24T21:36:20+0000

Hello!
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To add polynomials, combine like terms. Don't add exponents.

$(2mn + 4n^(2) ) + (5 {m}^(2) - 7mn)$

Remove the parenthesis and combine like terms.

$4n^(2) + 5 {m}^(2) - 5mn$
Rewrite in Standard Form:

$5m^(2) - 5mn + 4 {n}^(2)$

So the answer is C.

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