Question

Which is the equivalent to the following expression?
(3m+2mn-n2)+(m2+4mn-n2)

A: 4mn2+6mn-2n2
B: 4m4-6mn-2n4
C: 3m2-6mn+2n2
D: 4m2+6mn+2n2

and why?

Answer 1

A because if you take that equation and add it together you get the same answer as "A"

Answer 2

In the second half of the equation, is m raised to the 2nd?

Answer 3

all of the numbers following the letters in the equation are exponents

Answer 4

Unless the question is typed incorrectly, none of those answers are correct.
(3m+2mn-n^2)+(m^2+4mn-n^2)
3m+m^2=3m^2
2mn+4mn=6mn
-n^2+-n^2=0
Which results in 3m^2+6mn as your final answer.