14m^2 n^3 + 6 m^3 n^3 + 3m^2 n^3 =

ANSWER: 23m^6 n^9

5 answers

Nope,
as I told you yesterday, you can only add/subtract "like" terms, that is
they must be the same in their variables and exponents.

So here I see two terms ending in m^2n^3 and one term ending in m^3m^3, so their sum is

17m^2n^3 + 6m^3n^3

(think of it this way:
14 apples + 6 oranges + 3 apples,
so you would have 17 apples + 6 oranges )
14m^2 n^3 + 6 m^2 n^3 + 3m^2 n^3 =
... and now you have changed it to

14 apples + 6 apples + 3 apples.
so is 23m^6 n^9 correct
NOOOOOO!

why are you changing the exponents???

answer: 23m^2n^3
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